PARASITICA — TRIGONALID^. 37 



abrupt anteriorly, prothorax jirolDiised into a neck ; metatliorax <;radually 

 sloping behind; posterior tibiiB strongly clavate, being slender at base and 



much thickened toward the tip Feeims Fabr. 



Abdomen attached to the dorsum of metatliorax remote from scutellum, by 

 means of a slender abrupt petiole which is about as long as the remaining 

 segments together, which form a strongly compressed, broad ovate or 

 hatchet-shaped body, the entire abdomen shorter than head and thorax ; 

 ovipositor not exserted ; head not prolonged behind the eyes which are 

 unusually remote from base of mandililes ; scape long; mesothorax small, 

 depressed, prothorax not elongate ; metathorax rather abruptly declivous 

 behind ; posterior legs unusually long, slender. 



Anterior wings with a complete marginal cell, broad and truncate at apex, 

 and one complete rhomboidal submargiual cell, third discoidal cell not en- 

 closed Kvaiiia Fabr. 



Anterior wings without marginal, submargiual and discoidal cells, only the 

 costal cell and a basal nervure distinct Hyptia Illig. 



The genus Aulamis is at present represented by seventeen species 

 from different parts of the country ; of Faenus eight species have 

 been described, all but one from Colorado and British America; 

 Pammegijichia has one species from Canada ; Evania two and Hyptla 

 two. The si)ecies of Evania are parasites upon the cockroach (Blattae). 

 The habits of the other genera have not been observed, although 

 Fcenus is said to be parasitic upon certain Bees. 



Family TRIGONALID^E. 



This family contains only the genus Trigonai.ys Westw., which 

 has the head large, subquadrate, much extended behind the eyes, 

 face short and broad; clypeus emarginate anteriorly ; labrum very 

 small; mandibles large, robust, apex with three or four teeth; max- 

 illary paljn G-jointed, labial j)al[)i 3-jointed ; antennse inserted near 

 the base of the clypeus, remote, about as long as the head and thorax, 

 about 25-jointed, the first joint short, subglobose ; eyes relatively 

 small, reaching the base of the mandibles ; ocelli placed in a triangle 

 on the broad vertex ; prothorax not seen from above ; mesothorax 

 al)ruptlv truncate in front, fitting tolerably close to the broad head ; 

 scutellum subbitubercidate, excavated on the posterior middle ; meta- 

 thorax short and obliquely declivous posteriorly ; wings moderately 

 narrow, stigma well developed, elongate, costal cell distinct ; marginal 

 cell broad, lanceolate, reaching nearly to the ajiex of the wing; four 

 submargiual cells, the .<econd and third small, the former subtrian- 

 gidar and the latter subquadrate, the fourth extending to the tip of 

 the wing, the second receiving the first recurrent nervure near the 



