THE WATER-BOATMEN. 1083 



McCullers, N. Car., Sept. 10 (Brimley). Ranges from Mas- 

 sachusetts and New York west to Michigan and southwest to 

 North Carolina, Georgia and Kansas. Abbott calls it "a deli- 

 cately marked and very variable species." 



VII. Corixa Geoffroy, 1762, 477. 



Species resembling very closely those of Arctocorixa in form 

 and color, but always more shining and not at all or very faintly 

 rastrate ; head somewhat broader with hind angles more pro- 

 longed. Males with front tibia prolonged above the basal 

 fourth or more of pala in the form of a triangular spur or 

 rounded lobe (pi. XII, fig. 18 ; fig. 215, /) , and asymmetry and 

 strigil of ventrals sinistral or on the left side. Eight species 

 are known from North America, six of which occur in the east- 

 ern states. 107 



KEY TO EASTERN SPECIES OF CORIXA. 



a. Dark pronotal lineations not more than 10. 

 b. Length, 5 or 6 mm.; dark pronotal cross-lines 8 — 10. 



c. General color yellow with fuscous markings ; head yellow, vertex 



fuscous; pale cross-lines of pronotum all regular, as wide or 

 slightly wider than the dark ones; form more robust; pala and 

 pegs of male as in pi. XII, fig. 18. 1246. verticalis. 



cc. General color blackish-fuscous; head wholly fuscous; pale cross- 

 lines of pronotum narrower than dark ones; form more slender; 

 pala of male with upper edge regularly curved, not angulate 

 as in verticalis, pegs 18 in a straight oblique row. 



1247. reticulata. 

 bb. Length less than 4 mm.; dark pronotal cross-lines not more than 

 six. 



d. Pronotum with but three dark cross-bars ; pale markings of corium 



forming three evident but ill-defined longitudinal rows; pala 

 and pegs of male as in fig. 215, /. 1248. macroceps. 



dd. Pronotum with five or six dark cross-bars ; pale markings of 

 corium not arranged in rows. 

 e. Clavus with dark bars crossing the entire disk; vertex without 

 fuscous stripes; pronotum finely rastrate, with pale cross- 

 lines very narrow, broken or confused. 1249. minima. 

 ee. Clavus with an oblique area on inner basal third devoid of dark 

 marks ; vertex with three fuscous stripes ; pronotum almost 

 smooth, the pale cross-lines regular and as wide as dark ones. 



1250. PULCHRA. 



aa. Pronotal lineations 12; tegmina dark and dull; males unknown; 



length, 5 mm. 1251. sellaris. 



107 The C. hurmeisteri Fieber from "America boreali" is not included in the key, 

 but a translation of the original description is appended. 



