55° CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Branford, n May (H. W. W.), 28 July (H. L. V.), 1905; Canterbury, 

 14 Aug., 1905 (B. H. W.) ; Cornwall, 29 May (K. F. C.) ; New Haven, 

 10 May, 1911 (A. B. C.) ; 6 July (H. L. V.), 20 July (W. E. B.), 1904. 



Subfamily Capsinae. 

 Key to Tribes. 



1. Slender ant-like species, abdomen constricted at base; lateral 



margins of pronotum indistinct, more or less sinuate; hemelytra 



medially coarctate (p. 655) Myrmecorini 



Form not ant-like, abdomen not distinctly constricted; pronotum 

 with lateral margins distinct, frequently finely carinate ; hemelytra 

 with embolar margins straight or slightly arcuate 2 



2. Ostiolar peritreme small, poorly developed, its dorsal margin 



scarcely extending dorsad as far as ventral margin of epimeron 

 of mesothorax ; tibiae destitute of spines but sometimes strongly 

 nigro-pubescent ; body impunctate ; pronotal collar broad, 

 strongly convex, width of collar (measured cephalo-caudally) 

 usually as great as width of calli; genae high, head vertical, 

 rarely inclined; segment i of hind tarsi twice as long and thicker 



than the second (p. 550) Resthenini 



Ostiolar peritreme prominent, its dorsal margin extending well 

 above ventral margin of epimeron of mesothorax ; tibiae bearing 

 rows of spines, sometimes rather fine ; dorsum frequently punc- 

 tate ; pronotal collar not so broad and prominent as the above ; 

 genae of medium height or low, rarely high but in such case the 

 vertex, frons and tylus are sub-confluent in a wide arc, the gula 

 long; segment i of hind tarsi rarely longer than segment ii, but 

 if so, never thicker than segment ii (p. 560) Capsini 



Tribe RESTHENINI. 



Key to Genera. 



1. Stricture of pronotal collar joining base of coxal cleft; head when 



viewed from the side oblique, gula rather long, oblique . . Opistheuria 

 Stricture of pronotal collar interrupted at side, not joining directly 

 with base of coxal cleft; head short, vertical, gula short, 

 scarcely apparent Platytylellus 



Opistheuria Reuter. 



Key to Species and Varieties. 



1. Pronotum, and ventral surface except genital segments, orange 

 red ; scutellum and hemelytra black, embolium and outer margin 

 of clavus and cuneus, orange red typical clandestina 



(a) Pronotal disk largely black; ventral surface except genital 



segment, orange red variety dorsalis 



(b) Pronotal disk largely black; ventral surface chiefly black 



variety ventralis 



O. clandestina Van Duzee. 



Pomona Jour. Ent. Zool., vii, no, 1915- 



Length 7.4 mm., width 3.3 mm. ; embolar margins distinctly 

 arcuate on apical half ; color orange-red, antennae, tylus and front, 



