390 CHARLES T. BRUES. 



merit visible. Gland opening on fifth segment small, with its margin 

 hardly at all thickened ; posterior margin of second to fifth segments 

 marked off by wide rows of enormous macrochsetse which extend 

 more than half way across the abdomen. Sexual organs smaller 

 than usual. 



This peculiar genus, which is known only in the female sex, is 

 represented by a single species. 



Xanionotum hystrix Brues. 

 Female. — Length 1.25 mm. Light yellow, almost white, the head much darker 

 above, except an irregular yellowish spot on the vertex, all the large macrochsetre 

 fuscous. Wings with about eleven of the large macrochseta? and each abdominal 

 band consisting of about twenty bristles. Thorax tinged with darker above, 

 especially in front. Legs concolorous with the body, tarsi darker yellow, legs 

 finely black hairy, without stout bristles except one spur each on the tibiae. 



Two specimens, Austin, Texas, March 24, 1901, in nests of the 

 ant Eeiton opacithorax Em., also another female from the same 

 locality in a nest of Eeiton Schmitti, May, 1902. 



PULICIPHORA Dahl. 



1897. Dahl, Zool. Anz., xx, p. 410. 



1898. Dahl, Situngsberichte d. Naturf. Freunde., p. 185. 

 1898. Dahl, Zool. Anz., xxi, p. 308. 



1898. Wandolleck {Stethopathus), Zool. Jahrb. Abth. f. Syst., p. 424. 

 1901. Brues {Rtethopathus), American Naturalist, May, p. 354. 

 1903. Melauder and Brues (Stethopathun), Biological Bulletin, June. 



Male. Front with four bristles in an upper row and 2-4 more 

 anterior bristles. Third antennal joint rounded, arista apical. Me- 

 diastinal vein distinct; third longitudinal vein simple, not forked ; 

 four light wing veins present. Legs long and slender with no 

 bristles except the spurs on the posterior tibiae. Pulvilli and em. 

 podium wanting. No bristles on the posterior wing margin at the 

 base. 



Female. Both wings and halteries absent, eyes much reduced, 

 ocelli present. Thorax small, rounded when seen from the side, 

 transverse when seen from above, twice or three times as wide as 

 long. Abdomen elliptical first four dorsal segments strongly chit- 

 inized, covering the greater part of the dorsum of the abdomen. 

 Legs stouter than in the male. 



Represented by three species, two from the Bismarck Archipelago, 

 and one from the eastern part of the United States. 



