132 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



9. ACROSCHISMUS TEXANI, new species. 



Host.—Polistestexanus Cresson, July 25, 1906, Victoria, Texas (pi. 

 9, fig. 9). 



Female.— Length of cephalothorax 1.59 mm., breadth at spiracles 

 1.56 mm., breadth at base of head 1.06 mm., distance between man- 

 dibles at base 0.27 mm. Cephalothorax brown, lighter toward apex; 

 slightly longer than broad; constricted at base, margin convex to 

 apex with slight sinuations in front of mandibles and at side of head; 

 spiracles dorsal, not reaching lateral edges; mandibles large quadrate 

 with large tooth on inner apical angle. 



Type.— Cat. No. 10121, U.S.N. M. 



10. ACROSCHISMUS RUBIGINOSI, new species. 



Host. — Polistes rubiginosus Lepeletier; Logansport, Louisiana, June 

 6, 1906; W. D. Pierce, collector (pi. 9, fig. 11). 



Female. — Length of cephalothorax 1.67 mm., breadth at spiracles 

 1.59 mm., breadth at base of head 1.17 mm., distance between man- 

 dibles 0.30 mm. Cephalothorax dark brown to line between posterior 

 angles of head, thence much lighter; slightly longer than broad; con- 

 stricted at base, margin oblique with emarginations in front of spira- 

 cles, and at base of head, between which it is slightly convex; api- 

 cally sinuate truncate; spiracles dorsal; mandibles subquadrate, api- 

 cally strongly emarginate between outward curving tooth on inner 

 angle and rounded lobe of outer angle. 



Type.— Qui. No. 10119, U.S.N.M. 



ii. ACROSCHISMUS MAXIMUS, new species. 



Host. — Polistes rubiginosus Lepeletier, Texas (pi. 9, fig. 8). 



Female— Length of cephalothorax 1.71 mm., breadth at spiracles 

 1.10 mm., breadth at base of head 1.48 mm., distance between man- 

 dibles 0.32 mm. Cephalothorax dark brown, lighter at apex and in 

 large median emargination of the dark pigment; considerably longer 

 than broad; constricted at base, margin somewhat concave from 

 widest point to base of head, thence veiy convex to apex., rounding 

 emarginate in front of mandibles, spiracles dorsal; mandibles consid- 

 erably wider at base than at apex, apically emarginate between large 

 tooth on inner angle and the large blunt outer angle. 



Type.— Cat. No. 10118, U.S.N.M. 



11. Genus SCHISTOSIPHON Pierce (19C8.) 



Type of genus. — Schistosiphon peckii Kirby (1813). 



Name derived from oico-oq = clef t + ac^xbv = siphon = cleft siphon, 

 referring to the apical cleavage of the oedeagus. This genus lies 

 between the typical European Xenos and the typical American 



