502 FAMILY XVI. — ENICOCEPHALID^E. 



dd. Form of body and antennae not as above; ocelli present (except 

 in Carthasinae and Saicinae) ; front coxae not greatly elongated, 

 their cavities opening downward ; elytra in great part coria- 

 ceous, the usual divisions present. Terrestrial or thamnophi- 

 lous; predatory. Family XIX. Reduviid^e, p. 536. 



cc. Prosternum without a stridulatory groove as in c; beak 4-jointed, 

 the first joint very short; head without a transverse groove; 

 front legs raptorial (fig. 6, m). Terrestrial or thamnophilous; 

 roving; predaceous. Family XX. Nabid^e, p. 587. 



Family XVI. ENICOCEPHALID^ Stal, 1860, 81. 



Very small slender bugs, having the head porrect, elongate, 

 strongly constricted by a transverse groove just behind the 

 eyes, ocelli present on its hind lobe ; antennae and beak each 

 4-jointed; pronotum 3-lobed, the lobes separated by strong 

 transverse constrictions ; elytra wholly membranous and with 

 few veins ; front tarsi 1-jointed, middle and hind ones 2-jointed ; 

 prosternum without a stridulatory groove. Only about a dozen 

 species are known, two from the United States. For literature 

 treating of the North American species see Uhler, 1892; 

 Champion, 1898; Johannsen, 1909; Bergroth, 1913a, 1915. 



I. Systelloderes Blanchard, 1852, 224. 



Species possessing the characters of the family and having 

 the posterior lobe of head subglobose, constricted both before 

 and behind ; fourth joint of antennas slightly shorter and thick- 

 er than third; beak not reaching base of head, the first and 

 second joints very stout, third almost as stout, nearly as long 

 as the others united, fourth very short, acute ; pronotum longer 

 than wide, middle lobe suborbicular, hind one shorter and 

 wider ; elytra narrow, surpassing abdomen, the discal cell open 

 behind. Three species are known, one from Chile, a second 

 from Guatemala and the third from our territory. 



477 (684). Systelloderes biceps (Say), 1832, 32; I, 356. 



Elongate, slender. Pale yellow or grayish-brown, strongly shining, 

 very finely pubescent; head, base of beak, antennae, and front lobe of 

 pronotum often in part darker. Antennae slender, bristly-hairy, joint 1 

 stoutest, 2 — 4 subequal in length, the fourth subfusiform, slightly flat- 

 tened. Eyes large, coarsely granulated. Ocelli prominent. Middle lobe 

 of pronotum smooth with a fovea or impressed line on disk and an- 

 other each side; hind lobe very finely, distinctly punctate, its hind mar- 

 gin broadly concave. Scutellum small, triangular, its apical half with 

 a fine median longitudinal carina. Front tibia with apex dilated, com- 

 pressed and armed with seven stout spines; also with a row of fine setae 



