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Classification ........Dasyus variabilis Moser, 1918

Dasyus collaris: homeotype male.
Photos by Kerry Katovich.
Dasyus collaris: female.
Photo by Kerry Katovich
left lateral view
caudal view
Genitalia of Dasyus collaris.
Distribution of Dasyus collaris.
Family............ Subfamily.......
Melolonthinae Tribes 

Incertae sedis


Melolonthinae Taxa Map

Melolonthinae Catalog

Dasyus Key

Diagnosis: this species is recognized by its distinct coloration and size, male pronotum and elytra are black, females have a black pronotum and reddish-orange elytra. Total length (14 mm) and width (5.6 mm) of D. variabilis is approx 2X that of D. collaris.


Measurements: Prothorax at widest point 4.0 mm, elytra at widest point 5.6 mm, length 14.0 mm.

Color and vestiture: Head, thorax and abdomen shinning black, covered with vestiture of short, yellowish-orange setae, elytra black, (reddish-orange in females).

Head: Eyes small in dorsal view (ocular width 1/4 interocular width); cypeus coplaner with frons, frons angled at 30°; labrum in frontal profile narrowly ovate, weakly emarginate, slightly produced anteriorly from clypeus, labrum not coplaner with clypeus; labium with prementum elongate, ventral surface with medial groove; antennae 9-segmented, segments 7-9 forming the elongate club, equal to length of segments 2-6 combined.

Prothorax: Pronotum oblong, transverse, widest medially, posterior angle obtuse, posterior margin weakly convex; prothoracic leg with coxae elongate; tibia lacking teeth, medially with a stout spur; pretarsus with claws strongly divergent, equal in length, both claws narrowly split.

Mesothorax: Scutellum subtriangular, surface punctate and setose; elytra ovate, width equal to length, elytral epipleuron forming a rounded bead, margin with a slight membranous border, dorsal surface smooth, surface punctate, punctures in distinct vertical lines, anterior umbone prominent, posterior umbone moderately produced; pretarsus of mesothoracic leg with claws equal, divergent, simple.

Metathorax: Metathoracic leg with coxae clearly separated; femur broadly ovate, widest medially; tibia subtriangular, widest medially, narrow proximally, posteroventral margin with a pair of long, stout spurs; pretarsus with claws similar to mesothoracic legs.

Abdomen: Ventrites 2-4 subequal in length, 5th visible ventrite (=propygidium) equal in length to ventrites 2-4 combined, ventrite and sternite of 5th abdominal segment lacking a complete suture, 6th ventrite equal in length to 5th ventrite length; ventromedial surfaceof male with a semicircular shaped pocket, margins of which are raised, thickened, posterior margin convex; pygidium subtriangular, width equal to length, posterior margin blunt.

.... Entomology Home Research UNSM Entomology Database Scarab Workers

Author: Kerry Katovich
Generated on:
University of Nebraska State Museum - Division of Entomology