1.
.
Pronotum with basal bead absent, only lightly impressed near the posterior angles
.
6
 

1'.
.

Pronotum with basal bead present, complete or nearly complete (occasionally interrupted at middle)
.
2
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2(1).
.
.
.
Sternites 2-4 with posterior border deeply sinuate (Fig. 11). Pygidial disc of male (in lateral view) strongly, acutely protuberant (Fig. 12). Elytral epipleuron of female weakly arcuate at mexacoxae (ventral view) (Fig. 13)
 

2'.
.
.
.

Sternites 2-4 with posterior border straight or weakly sinuate (Fig. 14). Pygidial disc of male (in lateral view) not protuberant (Fig.15). Elytral epipleuron of female straight or notched, not arcuate at metacoxa (ventral view) (Fig. 16)
.
.
.
3
Figure 11
Figure 12
Figure 13
 
Figure 14
Figure 15
Figure 16
Figures 11-16. (11) Ventral view of sternites of Heterosternus. (12) Lateral view of abdomen and pygidium of Heterosternus. (13) Ventral view of epipleuron of female of Heterosternus. (14) Ventral view of sternites of Mesosternus. (15) Lateral view of abdomen and pygidium of Mesosternus. (16) Ventral view of epipleuron of female of Homoiosternus.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3(2).
.
Mesosternal process with apex rounded. Sternum with dense setae. Dorsal color yellow-brown or yellow-orange
.
4
 

3'.
.
.

Mesosternal process with apex acute. Sternum with scarce setae. Dorsal color dark red or mahogany with margins of the pronotum and elytral yellow
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4(3).
.
.
Mentum with anterior border sinuate (Fig.17). Sexual dimorphism not distinct. Posterior border of metafemur (male) without medial spine
.
.
5
 

4'.
.
.

Mentum with anterior border emarginate (Fig. 18). Sexual dimorphism distinct. Posterior border of metafemur (male) with medial spine
Figure 17. Ventral view of mentum of Homoiosternus
Fig. 18. Ventral view of mentum of Plesiosternus
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
5(4).
.
.
.
Metatibia of male with dense setae on the inner margin (Fig. 19). Parameres fused at mid-base. Females with elytral epipleuron parallel throughout, not convergent at apex (ventral view) (Fig.20). Mountains of Chiapas (Mexico) and Guatemala
 

5'.
.
.
.

Metatibia of male with scarce setae on the inner margin (Fig. 21). Parameres not fused at mid-base. Females with elytral epipleuron convergent at apex (ventral view) (Fig. 22). Mountains of Durango, Nayarit, and Jalisco (Mexico)
Figure 19
Figure 20
Figure 21
Figure 16
Fig. 19. Ventral view of metatibia Mesosternus (male). Fig 20. Ventral view of epipleuron of female of Mesosternus. Fig. 21. Ventral view of metatibia of Homoiosternus (male). Fig. 16. Ventral view of epipleuron of female of Homoiosternus.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
6(1).
.

 Anterior border of clypeus sinuate (Fig. 22, Fig. 23, Fig. 24, Fig. 25)
.
7
 

6'.

 Anterior border of clypeus rounded (Fig. 26)
Figure 22. Head of Elcarmeniella
Figure 23. Head of Parisoleoides
Figure 24. Head of Parisolea
Figure 25. Head of of Macropoidelimus
Figure 26. Head of Macropoides
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
7(6).
.
 Dorsal color green or olive-green without longitudinal markings. Metacoxae of male with long, apical spine (Fig. 27)

 
Figures 27. Posterioventral view of Macropoidelimus (male) showing metacoxal spine.

7'.
.

 Dorsal color tan, cream, or yellowish with or without longitudinal markings. Metacoxae of male without apical spine
.
8
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8(7).
.
Metatibia of male with long, inner spine. Body length 30-35 mm
 

8'.
.

Metatibia of male without inner spine. Body length 15-20 mm
.
9
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
9(8).
.
Metatrochanter with apex not produced beyond posterior border of femur (Fig. 28). Metatibia of male straight (Fig. 29)
.
10
 

9'.
.
.

Metatrochanter with apex weakly spine-like and produced beyond posterior border of femur (Fig. 30). Metatibia of male curved (Fig. 31)
Figure 28
Figure 29
Figure 30
Figure 31
Fig. 28. Metatrochanter of Parisolea. Fig. 29. Metatibia Parisolea or Parisoleoides. Fig. 30. Metatrochanter of Elcarmeniella. Fig. 31. Metatibia of Elcarmeniella.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10(9).
.
.
 Clypeus near apex punctostriate (Fig. 23). Mesotarsomeres of male thickened and foreshortened (Fig. 32). Modified mesostarsal claw of male wider than modified protarsal claw; apex bulbous and widely split (Fig. 32)
 

10'.
.
.
.

Clypeus near apex punctate or rugopunctate (Fig. 24). Mesotarsomeres of male not thickened and foreshortened (Fig. 33). Modified mesotarsal claw of male subequal in width to modified protarsal claw; apex not bulbous and widely split (Fig. 33)
.
.
.
Parisolea
Figure 23
Figure 32
Figure 24
Figure 33
Fig 23. Head of Parisoleoides. Fig. 32. Modified mesotarsal claw of male Parisoleoides. Fig. 24. Head of Parisolea. Fig. 33. Modified mesotarsal claw of male Parisolea.