148 SERKICOKNIA. 



25. Pachyschelus nigricollis. (Tab. VII. figg. 21, 21 a.) 



Niger, nitidus, paullo convexus ; elytris violaceis, sat fortiter punctatis, ad apicem acuminatis, lateribus ad 



medium angulatis. 

 Long. 1| lin. 



Sab. Mexico, Cordova (Salle). 



This is a rather broad, not very convex species, with a form approaching diamond- 

 shape. The head is black and shining. The thorax is black and shining ; it has small 

 but distinct punctures scattered over the disc ; the sides are somewhat narrowly 

 bordered with dull green, the green part being closely punctured. The elytra at the 

 base are as broad as the base of the thorax, a little widened to the middle, and then 

 obliquely and almost rectilinearly narrowed to the apex; the lateral impression is 

 very well marked. The terminal segment of the abdomen in the male is very much 

 narrowed, produced and deflexed, almost truncate at the apex, with eight nearly 

 equal, short, not very acute teeth ; owing to the apex being deflexed, these teeth are 

 only visible in certain positions (fig. 21 a). 



26. Pachyschelus centralis. 



Rotundato-ovalis, leviter convexus, subtus niger, nitidus, supra brunneo-seneus ; capite thoraeeque confertim 



subtiliter rugoso-punctatis ; scutello triangulari, lsevi ; elytris confertim rugosis. 

 Long. 1| lin. 



Hab. Guatemala, El Tumbador 2500 feet (Champion). 



This is one of the most rotund species of the genus. The upper surface is dull 

 owing to the dense sculpture. The head and thorax are densely punctured. The 

 elytra are somewhat differently sculptured, being more rugose and somewhat closely 

 strigose near the base ; the suture below the scutellum is slightly shining ; the lateral 

 impression is only lightly indicated. 



Two female examples. 



27. Pachyschelus lunifer, (Tab. VII. figg. 22, 22 a.) 



Fere rotundatus, leviter convexus, niger, creberrime punctatus, pube brevi grisea dense tectus, scutello lunaque 

 communi in disco elytrorum nigriB nitidis ; thoracis lateribus aureo-viridi marginatis ; genubus et tibiis 

 anticis supra aureis. 



Long. If lin. 



Hab. Guatemala, Volcan de Atitlan 3000 feet (Champion). 



A very rotundate species, only a trifle longer than broad, rounded in front, very 

 slightly narrowed posteriorly ; densely clothed with short pale grey pubescence, except 

 the scutellum (which is almost bare) and a large lunate spot (common to both the 

 elytra), where the pubescence is black. The thorax is very short and broad, and is 

 deeply semicircularly emarginate in front, so that the head is much more imbedded in 

 the thorax than is usually the case. The terminal segment of the abdomen of the 



