LIUS.— PACHYSCHELUS, 137 



This species agrees with the preceding in form, but perhaps has the elytra a trifle 

 shorter. The head has the lower part of the face brassy, except in two or three 

 examples. The punctures on the thorax are few and very fine. The elytra are 

 striate-punctate ; with the usual oblique impression before the apex very shallow. 



Out of forty-eight examples only ten have the head and thorax coppery ; they were 

 taken with the specimens with the black thorax at Bugaba, except one, which is from 

 Zapote, Guatemala. 



PACHYSCHELUS. 



Pachyschelus, Solier, Ann. Soc. Ent. Fr. ii. p. 313 (1833). 

 Brachys, pars, Laporte & Gory, Mon. ii. p. 7. 



With the exception of two from the Malay Archipelago, all the species of this 

 genus are American, these ranging from the United States to Peru. 



The structure of the apex of the abdomen of the males appears to afford good 

 specific characters. Of several species Mr. Champion obtained long series, and when- 

 ever this has been the case I have found the arrangement and form of the teeth constant. 

 The teeth are, however, evidently liable to be worn and occasionally broken, but a little 

 experience enables one to see when this is the case. A few specimens have been met 

 with in which the terminal segment is evidently malformed: a very notable case is 

 figured on Tab. VIII. fig. 13. 



w/ 1. Pachyschelus constans. 



Late ovalis, parum eonvexus, niger, nitidus ; capite thoraceque aureo-seneis ; elytris viridi-cyaneis, subtiliter 



striato-punctatis. 

 Long. 1| tin. 



Hab. Panama, Volcan de Chiriqui 2000 to 4000 feet (Champion). 



The head is lightly longitudinally impressed in front, with numerous distinct punc- 

 tures placed not very close together. The thorax is very slightly impressed at the sides 

 * before the posterior angles ; there are a few small punctures scattered over the surface. 

 The scutellum is smooth and coppery. The elytra are rather dark bluish-green, 

 moderately convex, with lines of very fine punctures, and with some fine punctures in 

 the interstices ; as broad as the thorax at the base, slightly widened to a little before 

 the middle, the side between the shoulder and the widest part nearly rectilinear, then 

 obliquely narrowed to the apex, the curvature being very slight; at the side below 

 the humeral callosity there is a distinct but not very large impression, with a distinct 

 swelling behind it. 



One example differs from the thirty-seven others in having the elytra purple. 



biol. CBNTE.-AMEE., Coleopt., Vol. III. Pt. 1, October 1889. T 



