138 Journal New York Entomological Society. ^^'°^- xxviii. 



3-jointed; ocelli wanting; labrum rather large, arched and protruded; 

 mandil)les short, strong, usually toothed and rather spoon-shaped; 

 maxillce well developed; maxillary palpi two-jointed; labium well de- 

 veloped, arched, protruded; labial palpi minute and unsegmented, 

 almost obsolete ; first segment with a large well-developed plate on 

 both ventral and dorsal surfaces; true legs wanting; cerci wanting; 

 spiracles crescentic, one large one on either side of the second seg- 

 ment and one small one on either side of each of the fourth to eleventh 

 segments, on the anterior dorso-lateral surface." 



Key to the Species of Pachyschelus. 



1. Elytra with a subtransverse or diagonal line of whitish pubescence just be- 



fore the apices, last ventral segment of male with three small teeth (rarely 



trace of fourth) on each of two prominent processes purpureus Say. 



Elytra glabrous, last ventral segment of male with four small teeth on each 

 of two prominent processes 2 



2. Elytra black with aeneous lustre Isevigatus Say. 



Elytra blue 3 



3. Head and thorax blue to bluish black schwarzi Kerremans. 



Head and thorax asneous var. oculatus Schaeffer. 



Pachyschelus purpureus (Say), 36-164. 

 auicricanus Gory, 41-346. 



(Original description.) 



" Ovate, black, elytra purple. Inhabits Indiana. Body black ; head with 

 distinct punctures ; front with an indented abbreviated line placed low down ; 

 thorax with scattered discoidal punctures; no lateral indentation; elytra 

 purple ; indented at the middle of the base and behind the humerus ; punctures 

 rather large but not deeply impressed, placed in series and obsolete behind, 

 tibijc angulated. Length under three-twentieth of an inch.* 



" This insect is certainly cogeneric with the preceding but it cannot be 

 placed in the Trachys or even in Aphanisticus if piisilhis Olivier can be con- 

 sidered as a type of it." 



It is rather remarkable that Say did not mention the subtransverse 

 or diagonal line of whitish pubescence just before the apices of the 

 elytra, the faint spot of white pubescence slightly above the centre 

 near the suture which often runs into a line nor the surface being 

 sparsely clothed with white hairs which are shorter and not as close 

 together as those forming the spots or lines. The ventral surface is 



