NORTH AMERICAN COLEOPTERA. 63 



H. (lelata n. sp. — Oval, slightly oblong, subdepresserl, head and thorax 

 yellow, sometimes piceous, elytra piceous, with a faint surface lustre. Antenna' 

 piceous. the basal joints paler beneath. Head alutaceous, punctate. Thorax as 

 in modesta, but without distinct hind angles, the transverse depression not deep ; 

 surface alutaceous, sparsely punctate; elytra not closely punctate; punctures 

 feebly impressed, apex much smoother. Body beneath and legs yellow, meta- 

 pectus piceous, distinctly bronzed. Length .11 inch. ; 2.75 mm. 



Male. — Last ventral truncate, with a small emargiuation at middle. 



Female. — Last ventral entire. 



In this species the head and thorax, while usually yellow, tends to 

 become brownish or piceous. The meta-pectus is also similarly va- 

 riable in color. The surface lustre of the elytra may be violaceous 

 or bronzed, but in none of the dozen specimens before me is there 

 any trace of blue. 



Collected abundantly at San Antonio, Texas, by H. F. Wickham. 

 Occurs also in Arizona. 



TRIRHABDA Leo. 



' Head broad, moderately deeply inserted, eyes oval, convex and 

 entire. Antennae slender, three joints the length of the body, first 

 joint claviform, second small, but oblong, third not quite twice as 

 long as the second, fourth longer than the third, joints 4-10 gradu- 

 ally decreasing in length, eleventh longer ; labrum transverse, emar- 

 ginate ; maxillary palpi not very stout, last joint conical, acute, 

 narrower than the preceding joint and about as long. Thorax much 

 broader than long, widest at middle, the angles distinct, and more or 

 less prominent; scutellum short, obtuse; elytra elongate, parallel, or 

 slightly broader behind, distinctly margined at sides, the epipleurse 

 narrow, but extending somewhat posterior to the middle ; prosternum 

 not prolonged between the coxse, these prominent and contiguous ; 

 middle coxjb slightly separated in front, contiguous posteriorly ; 

 metasternal side-pieces moderately broad, narrower posteriorly. Legs 

 moderate, the tibiae faintly grooved on the outer side, without spurs 

 at tip ; tarsi not long, the first joint as long, or a little longer than 

 the next two ; claws bifid, but somewhat dissimilarly in the sexes. 



It seems not to have been observed by those who have had occa- 

 sion to study the genus, that the claws are somewhat dissimilar in 

 the two sexes. In the male the claws are narrowly bifid at tip, while 

 in the female they are more broadly bifid posterior to the tip, seeming 

 almost to be toothed. 



The first attempt at a study of our species was made by Dr. Le- 

 Conte (Proc. Acad. 1865, p. 219), who separated the species with 



TEANS, AM. ENT. SOC. XX. APRIL, 1893. 



