NORTH AMERICAN COLEOPTERA. 197 



The conspicuous marking on the elytra render this an easily known 

 species. As far as specimens have been examined it is practically 

 invariable in its markings. 



Occurs quite commonly in Texas near the Rio Grande, extending 

 through Mexico to Brazil. 



H. lustrans Crotch. — Oval, moderately shining, beneath in great part 

 yellow, head and thorax yellow, elytra cobalt-blue. Aniennse half as long as 

 the body, piceous ; underside of two basal joints pale. Head entirely yellow, 

 except a narrow fuscous band between the eyes, frontal tubercles distinct, a 

 transverse impression above them, surface entirely smooth. Labrum piceous. 

 Thorax twice as wide as long, widest at base, sides slightly arcuate, margin not 

 explanate, anterior angles simple, color yellow, smooth and impunctate. Elytra 

 a little wider at base than tbe thorax, humeri rounded, umbone moderately dis- 

 tinct, limited within by a slight impression, surface smooth, almost absolutely 

 impunctate. Epipleurpe black Body beneath and abdomen entirely yellow, 

 the sides of the metasternum sometimes piceous. Femora yellow, the anterior 

 and middle tibiie and tarsi piceous, sometimes paler on the inner side, posterior 

 tibije piceous near the tip. Abdomen shining, sparsely punctate. Length .26 

 inch, ; 6.5 mm. 



This insect bears a very close resemblance to Dison. varicornin. 

 The claw joint of the posterior tarsus is still less thickened than in 

 either of the species of this genus, and, by the systems of classifica- 

 tion, would be very difficult to place generically. It is not. however, 

 a true Q^^dionychis, and the only course to adopt is that suggested by 

 Harold. 



Occurs in Texas. 



H. abfloininalis Chev. Oval, feebly shining, beneath piceous, thorax 

 yellow, elytra blue, or blue-black Antennae half as long as the body, piceous, 

 third joint slightly shorter than the fourth. Head black, shining, frontal tu 

 bercles moderately distinct, a transverse depression above them, surface smooth, 

 a few punctures near the eyes. Thorax twice as wide as long, distinctly broader 

 at base, sides arcuate, margin moderately explanate, front angles not dentiform, 

 color yellow, surface smooth and impunctate. Elytra a little wider at base than 

 the thorax, humeri rounded, umbone moderate, limited within by a distinct 

 depression, surface closely luinctate. more coarsely and densely in the female. 

 Epipleurfe black. Body beneath black, shining, abdomen black, the apex and 

 sides indeterminately rufous, surface sparsely punctate. Femora of all the legs 

 yellow, tibiae and tarsi black. Leng4h .30 — .40 inch. ; 7.5 — 10 mm. 



The elytral sculpture is very like that of CEd. thoracica in the 

 female, but in the male the punctures are finer and apparently less 

 closely placed. 



The specimens marked Texas in my own and the LeConte cabinet 

 were from the old Berlandiere collection, and are open to some doubt 

 as to locality. It is common in the adjacent regions of Mexico. 



