no. 1834. NEW SPECIES OF STREPSIPTERA— PIERCE. 497 



Genus CRAWFORDIA Pierce. 



CRAWFORDIA COCKERELLI Pierce. 



Host. — Panurginus ooylei Cockerell (auth. Cockerell). 



CRAWFORDIA LABROSI, new species. 



Host. — Pseudopanurgus labrosus Robertson, Carlinville, Illinois. 

 Described from one female collected July 3 by Charles Robertson. 



Female. — Length of cephalothorax 0.47 mm., breadth at spiracles 

 0.48 mm., breadth at base of head 0.45 mm., distance between 

 mandibles 0.11 mm. Cephalothorax light yellow, with anterior half 

 of margin clouded with brown. Abdomen with a very broad dark 

 brown band bordering the cephalothorax. Cephalothorax as long 

 as broad, subquadr angular, very broadly truncate at apex, which is 

 very little narrower than the width of the spiracles, strongly con- 

 stricted behind spiracles. Lateral margins from spiracles almost 

 parallel to a line through the bases of the mandibles, thence curving 

 and regularly convex with apex. Head with sides produced almost 

 to spiracles, mouth almost apical, mandibles broad, blunt, and 

 armed on inner apical angle with a short curved tooth. Spiracles 

 lateral, slightly prominent. 



Type— Cat. No. 13696, U.S.N.M. 



CRAWFORDIA RUDBECKXE, new species. 



Host. — Pseudopanurgus rudbeckix Robertson, Carlinville, Illinois. 

 Described from one female collected August 29 by Charles Robertson. 



Female. — Length of cephalothorax 0.49 mm., breadth at spiracles 

 0.51, breadth at base of head 0.49 mm., distance between mandibles 

 0.10. Cephalothorax light yellow, with margins tinged with orange. 

 Abdomen with a dark band bordering thorax. Cephalothorax 

 almost as long as broad, broadest behind spiracles, thence almost 

 evenly convex on sides and apex, but not subquaclrangular as in the 

 preceding species, strongly constricted behind spiracles. Spiracles 

 lateral, but not prominent. Head as in the preceding species, broad, 

 blunt, and armed on inner apical angle. 



Type.— Cat. No. 13697, U.S.N.M. 



Genus XENOS Rossi. 



Acroschismus Pierce. 

 Schistosiphon Pierce. 



After receiving considerable new material the writer has come to 

 the conclusion that the wing venation can not be used to separate 

 Xenos and Acroschismus, and has therefore combined all three genera, 

 which are parasites of Polistes. 



80796°— Proc.N.M.vol.40— 11 32 



