678 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Oncerotrachelus Stal. 

 O. acuminatus (Say). 



Het. New Harm., 32, 1832; Compl. Writ, i, 356, 1859. 



This little species has been taken at light and also by sifting in 

 New York and New Jersey. It may be recognized by the generic 

 and subfamily character. Its habits are unknown. 



Subfamily Stenopodinae. 



Key to Genera. 



1. Head with a furcate spine below on each side behind the eyes 2 



Head unarmed below, or armed with a simple spine, rarely with a 



subf urcate spine at sides of base 3 



2. First antennal joint incrassate, produced in a spine beyond the 



insertion of the second joint Pnirontis, p. 678 



First antennal joint not produced beyond the insertion of the 

 second; apex of head at base of rostrum unarmed; first joint of 



rostrum extending back beyond eyes ; fore femora unarmed 



Pygolampis, p. 679 



3. Ocelli considerably elevated; postocular part of head short, 



strongly narrowed backward; margins as seen from above, 



curved 4 



Ocelli not at all or slightly elevated ; postocular part of head not 

 at all, or very slightly and uniformly narrowed toward the back 



Stenopoda, p. 680 



4. First joint of rostrum nearly as long as, or longer than, second and 



third joints combined 5 



First joint of rostrum not longer than second joint 6 



5. Head produced ; fore femora unarmed beneath ; hind femora not 



reaching apex of abdomen; first joint of rostrum slightly exceed- 

 ing the combined length of the second and third joints 



Schumannia, p. 680 

 Head not produced ; fore femora unarmed, slightly incrassate ; 

 hind femora scarcely reaching apex of abdomen; first joint of 

 rostrum slightly exceeding the combined lengths of the second 

 and third joints Diaditus, p. 680 



6. First and second joints of rostrum equal; fore femora very little 



thickened, unarmed ; hind femora reaching beyond apex of abdo- 

 men Narvesus, p. 680 



First joint of rostrum much shorter than second; fore femora 

 incrassate, with small spines below ; hind femora just reaching 

 apex of abdomen Oncocephalus, p. 680 



Pnirontis Stal. 



Centromelus Fieber. 



This genus has the tibiae armed on the anterior edge with three 

 spines. There are but two species, both of which are known to 

 occur in the neighboring states. 



Key to Species. 



Basal joints of antennae spiny beneath; genae not prominent . .infirma 

 Basal joints of antennae unarmed; genae very prominent . . . .languida 



