PARASITICA — TRIGONALIDiH. 37 



abrupt anteriorly, prothorax jirolonged into a neck ; metathorax gradually 

 8lo))ing Ix'hind ; postorior tihite strongly <'lavatt', being slender at base and 



nnich thickened toward the tip Fcenua Fabr. 



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

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

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

 liatchet-sha|)ed body, the entire abdomen shorter than head and thorax ; 

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

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

 depressed, prothorax not elongate; metathorax rather abruptly declivous 

 behind ; jMistcrior legs unusually long, slender. 



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

 and one complete rhomboidal submarginal cell, thirA discoidal cell not en- 

 closed Evanla Fabr. 



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

 costal cell and a basal nervure distinct Hyptia Illig. 



The jjenus Anlacms is at present represented by seventeen species 

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

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

 PammegiscJiia has one species from Canada*; Evania two and Hyptia 

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

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

 Foenus is said to be parasitic upon certain Bees. 



Family TRIGONALIDiE. 



This family contains only the genus Tkigonalys Westv-, 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 palpi 6-jointed, labial palpi 3-jointed ; antennae inserted near 

 the base of the clyi)eus, remote, about as long as the head and thorax, 

 about 2o-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 

 abruptly truncate in front, fitting tolerably close to the broad head ; 

 scutellum subbituberculate, excavated on the posterior middle ; meta- 

 thorax short and oblicjuely declivous posteriorly ; wings moderately 

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

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

 submarginal cells, the second and third small, the former subtrian- 

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

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



