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



13. Prosternum with a median longitudinal transversely striated or 



granulated stridulatory groove visible anterior to front coxae, 

 receiving the tip of the rostrum; rostrum three-segmented, short 



and strong ; length not less than 5 mm 14 



Prosternum without a stridulatory groove; size large or small .. 15 



14. Terminal segment of antennae thickened; front legs highly modi- 



fied, stout, raptorial; moderate in size PHYMATIDAE, p. 692 



Terminal segment of antennae filiform (sometimes faintly divided 

 into numerous small parts) ; front legs usually much like the 

 others, though raptorial in function, sometimes somewhat thick- 

 ened and spinous; large or small in size REDUVIIDAE, p. 677 



15. Hemielytra closely reticulate in relief, membranous between the 



reticulations, more or less lace-like in appearance, size small 16 



Hemielytra not so reticulate, or absent ; size large or small 17 



16. Juga free, produced before apex of head, longer than tylus; hemi- 



elytra with a non-reticulate membrane, the rest reticulately punc- 

 tate ; one small species PIESMIDAE, p. 694 



Juga not prominent, not longer than the tylus; head sometimes 

 with dorsal anteriorly projecting spines; hemielytra of similar 

 texture throughout, densely reticulate ; numerous small species . . 



TINGIDAE, p. 695 



17. Pronotum divided into three lobes ; head contracted behind the 



eyes ; hemielytra wholly membranous, with a few distinct longi- 

 tudinal and cross veins ; very minute and delicate forms 



ENICOCEPHALIDAE, p. 693 

 Pronotum, head, and hemielytra otherwise constructed 18 



18. Rostrum really or apparently three-segmented 19 



Rostrum four-segmented, first segment sometimes short 23 



19. Body convex below, flat or slightly concave above; greenish in 



color ; clavus membranous, similar in texture to the membrane, 

 the latter without veins, corium somewhat thickened; small 

 aquatic predatory species living generally on floating vegetation 



MESOVELIIDAE, p. 674 

 Body usually very thin, flat above and below; when not distinctly 

 flattened hemielytra are not constructed as above; color not 

 greenish ; terrestrial or riparian 20 



20. Tarsi two-segmented; flattened species of moderate size living 



under dead bark ARADIDAE, p. 738 



Tarsi three-segmented 21 



21. Ocelli present . , 22 



Ocelli absent; hemielytra always much reduced, without mem- 

 brane ; rather small parasitic species CIMICIDAE, p. 668 



22. Hemielytra provided with a cuneus, membrane without long closed 



cells, sometimes without veins; sometimes brachypterous ; small 



in size ANTHOCORIDAE, p. 665 



Hemielytra without a cuneus ; membrane with four or five long 

 closed cells ; moderate or small in size S ALDIDAE, p. 408 



23. Ocelli absent 24 



Ocelli present, except in certain Lygaeidae which may be distin- 

 guished by the venation and ring structure 26 



24. Membrane with two large cells at base from which extend about 



eight branching veins; hemielytra without a cuneus; rather 



large strong forms [PYRRHOCORIDAE] 



Membrane with one or two small cells at base, very rarely with 

 longitudinal veins; cuneus distinct; rather small delicate forms 25 



25. First segment of rostrum longer than broad, extending generally 



somewhat beyond posterior margin of head; membrane with two 



small cells at base or rarely one MIRIDAE, p. 422 



First segment of rostrum little or not longer than broad, extending 



