SUBFAMILY III. — ORTHOTYLIN^. 807 



width of head across eyes; hind tibia? cylindrical; front half of 

 pronotum subcylindrical, its sides subparallel. 



IV. PSEUDOXENETUS, p. 818. 



I. Pilophorus Hahn, 1826, 23. 



Elongate, subcylindrical, sparsely pubescent species having 

 the head broadly triangular, declivent, compressed behind, tylus 

 depressed and fused with the front, beak reaching or slightly 

 surpassing middle coxa?; antennae stout, about half the length 

 of body, the joints variable as to species; pronotum subcam- 

 panulate, apex narrower than head across eyes, basal half con- 

 vex, sides sinuate, often with a broad vague constriction at 

 middle, calli obsolete; elytra entire, slightly surpassing abdo- 

 men, their sides broadly concave along the middle third ; corium 

 usually with a short bar composed of silvery-gray scales across 

 basal third which reaches only to claval suture and a second bar 

 of similar scales at apical third which is either entire or slightly 

 interrupted on the commissure ; clavus convex, strongly de- 

 flexed to corium, cuneus and membrane deflexed ; hind legs 

 with femora thickened, tibise more or less curved, tarsi with 

 joint 3 longest, 2 slightly shorter than 1. Of the genus Uhler 

 (1887a, 29) wrote: 



"The genus Philophorus has such a different facies from our other 

 known Capsidae that it would seem to be recognizable at once by the shape 

 and adjustment of the head alone. It is very broad and curves back be- 

 yond the sides of the swollen pronotum, sits close against it, is of a coni- 

 cal form, scooped out behind and below; there is a high carina connecting 

 the eyes, and the face is very sloping anteriorly. The ant-like form of 

 the body, especially in the nymph, together with its habit of rapidly 

 coursing over the bark of trees, renders it liable to be mistaken for one 

 of the small red or brown Formicidae." 



Nineteen nominal species of the genus occur in the eastern 

 states." 4 For convenience of treatment t'hey are divided into 

 three groups. 



KEY TO GROUPS OF EASTERN SPECIES OF PILOPHORUS. 



a. Elytra polished over the entire area behind the posterior silvery 

 crossbar. 

 b. Scutellum nearly flat or only moderately convex. Group I, p. 808. 

 bb. Middle of scutellum strongly convex, almost conically produced up- 

 ward. Group II, p. 813. 

 aa. Elytra polished behind the posterior silvery cross-bar, but only on 

 the outer area between the radial vein and mai'gin. 



Group III, p. 815. 



k, The P. schwarzi Reut. (1909, 741 was described from California and, accord- 

 ing to Knight (Ms.), all eastern records are based on wrong identifications. 



