THE THREAD-LEGGED BUGS. 513 



times pedunculate; antennas and legs with numerous long erect 



hairs 60 (fig. 7) ; elytra with the inner apical margin concave 1 ' 



(fig. 2). I. Stenolemus, p. 513. 



bb. Elytra with but one discal cell (figs. 4, 15) ; pronotum seldom with 



a deep constriction, never pedunculate; antennae and legs without 



long erect hairs." 1 



c. Front tarsi 2-jointed; meso- and metanota usually each with a 



spine; pronotum slightly constricted near front margin. 



II. Empicoris, p. 515. 



cc. Front tarsi 3-jointed ; meso- and metanota unarmed ; pronotum 



slightly constricted near middle; venation of elytra as in fig. 15. 



III. Lutevopsis, p. 523. 

 aa. Front tarsi rigid or inflexible, either 1-jointed or so heavily chitin- 

 ized that the sutures are invisible; body winged or apterous; claws 

 of front tarsi usually either unequal or single. 

 d. Front femora spinose from the base (figs. 16 and 17) ; pronotum 

 not extending over mesonotum. IV. Ploiaria, i;l> p. 524. 



dd. Front femora spinose from about the basal third or middle (fig. 

 32) ; pronotum in winged forms overlapping mesonotum to base 

 of wings. 

 e. Head without tubercles or spines ; elytra, when present, with one 

 discal cell (fig. 28) ; basal ventral spine of front femur much 

 longer than the others; front tarsi with two equal claws; length, 

 28 or more mm. V. Emesaya, p. 527. 



ee. Head normally with tubercles or spines (figs. 23 and 24) ; elytra, 

 when present, with two discal cells; front tarsi with one claw. 

 /. Head with two tubercles or spines, one between bases of anten- 

 nae, the other just beneath it decurved above base of beak (fig. 

 23) ; front tarsus with two rows of decumbent setae on its lower 

 surface (fig. 33) ; adults often winged, the elytra shorter than 

 abdomen; length, less than 18 mm. VI. Metapterus, p. 531. 

 //. Head with a single slender curved spine between bases of an- 

 tennae (fig. 24) ; front tarsus with two rows of very fine elon- 

 gate deflected knife-like teeth on its lower surface (fig. 25) ; 

 adults never winged ; length, 20 — 25 mm. 



VII. Ghilianella, p. 535. 



I. Stenolemus, Signoret, 1858, 251. 



Species of medium size and, for the family, of rather stout 

 form, having the head short, broader across the eyes than long, 

 its hind lobe armed with two short obtuse spines ; eyes very 

 large and prominent; beak stout, its second joint swollen at 



00 In our eastern species. 81 Except in Empicoris pilosus. 



02 McAtee & Malloch place this genus under that primary division of their key 

 having the "fore tarsi distinctly segmented, the dividing sutures always visible under 

 a high power lens," yet in the section leading directly to Ploiaria they say "tarsi 

 heavily chitinized, fused so closely that the oblique sutures are visible only under a 

 very high power lens." Since the sutures are invisible with the lenses at hand, I 

 place the genus under aa. 



