PACHYSCHELUS. 151 



32. Pachyschelus trapezoidalis. (Tab. VII. figg. 24, 24 a.) 



Trapeziformis, parum convexus, nitidus ; capite tboraceque seaeis vel brunneo-seneis, pubescentibus ; elytris 



cupreo-aeneis vel brunneo-seneis seneo-variegatis, pube griseo-alba lituratis. 

 Long. 1| lin. 



Hab. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 



This species closely resembles P. signatus in form and general markings. The elytra 

 are, however, a little longer, a trifle more gradually narrowed to the apical truncature, 

 and the sutural angle is distinctly produced. The terminal segment of the abdomen 

 of the male has a wide triangular emargination at the apex, with four triangular teeth 

 on the outer side placed very obliquely ; one example (fig. 24 a) has the apex much 

 worn, leaving only the central part of the emargination. 



A single specimen from Yolos, Mexico, appears to belong to this species, but has 

 the pubescence of a more distinctly sandy-yellow. 



33. Pachyschelus undulatus. (Tab. VIII. fig. 18.) 



Trapeziformis, convexus, nitidus, nigro-cyaneus ; thorace lateribus parce pubescente ; elytris tenuiter punctatis, 



fasciis duabus albis ornatis. 

 Long. 1| lin. 



Hab. Panama, Bugaba, San Lorenzo {Champion). 



This species approaches P. trapezoidalis in general form, but is much more convex, 

 especially in the thorax. The thorax is shining, with fine punctures here and there. 

 The elytra at the base are as broad as the thorax, almost parallel for not quite half 

 their length, and then obliquely narrowed to the apical truncature ; the apical margins 

 are rather unusually denticulate ; there is a white spot close to the scutellum ; the 

 first band commencing at the lateral angulation descends slightly to about the middle 

 of the elytron, then ascends obliquely, and, turning over, descends to the suture ; the 

 anteapical fascia is very distinct — at first it is transverse, then ascends obliquely a very 

 short distance, and then descends to the suture. The terminal segment of the abdomen 

 of the male is deeply excised at the apex, with two strong triangular teeth to the 

 projecting part on each side of the excision, and with a smaller acute tooth on the 

 outer side at a much lower level (fig. 18). 



34. Pachyschelus bifasciatus. (Tab. VIII. fig. 19.) 



Ovatus, convexus, sat nitidus, post medium oblique attenuatus, ad apicem utrinque oblique truncatus ; capite 

 thoraceque virescenti-cyaneis, tenuiter punctatis, parce pubescentibus; elytris nigro-cyaneis violaceo- 

 tinctis, minus nitidis, punctulatis, fasciis duabus albidis ornatis. 



Long. 1| lin. 



Hab. Guatemala, Teleman in Vera Paz (Champion). 



The elytra are obscure dark blue, with violet or purple tints at the base and sides ; 

 at the base they are as wide as the base of the thorax, very slightly widened (almost 

 parallel) to a little before the middle, then obliquely narrowed, slightly sinuate 

 posteriorly, and then more obliquely narrowed to the apex ; there are a few pale hairs 



