REVISION OF STREPSIFTERA — PIERCE. 163 



length of the postscutellum. The wings are very long, milky white, 

 and pubescent. The legs are very small and do not appear fit for use. 

 The prosternum is a mere rounded, oblong disk not connected with 

 propleurae, which are lacking; consisting only of the two coxae; tro- 

 chanters elongate, longitudinal, contiguous throughout, and flattened 

 anteriorly; femora and tibiae subequal, black, tarsus very small and 

 inconspicuous. Mesosternum as mesonotum, adjacent to head, ex- 

 cept in space occupied by the anterior coxae; coxae not contiguous, 

 placed just outside of the anterior coxae; femora a little longer than 

 the tibiae; tarsi three-jointed normal. Posterior legs longer than the 

 median and proportioned about the same except that the trochanters 

 are shorter. The last two pairs of legs silky pubescent, pulvilli yellow. 

 The genitalia could not be seen in this specimen. 

 Type.— Cat. No. 9829, U.S.N.M. 



7. Family DIOXOCERID^E Pierce, 1908. 



Type-genus. — Dioxocera Pierce, parasitic on XeropTilcea, a gypo- 

 nine genus, which is distributed over North America and the West 

 Indies. 



The family is characterized by the three-jointed tarsi, and four- 

 jointed antennae, with the third and fourth antennal joints laterally 

 produced as in the Xenidae. 



31. Genus DIOXOCERA Pierce (1908). 



Type-species. — Dioxocera insularurn Pierce, which is parasitic on 

 Xerophloea viridis Fabricius. The genus is confined to North America. 



Name derived from duo (o<r-) (two) + o£oc (branch) + nkpac 

 (horn) = two-branched antennae. 



Male. — Defined by family characterization. 



Male puparium. — Cephalotheca transverse obovate. Pharyngeal 

 area divided from occipital area by straight transverse side lines and 

 an arched median vertex. The three analogues on each side not 

 separated from one another by distances greater than the diameter 

 of the antennal analogue, and placed in a straight line. 



Female. — Cephalothorax subquadrate, with sides rounded, man- 

 dibles apical and prominent, pharyngeal orifice subapical; trans- 

 verse slit behind the middle, straight in median half, but deeply 

 retreating at sides. Dorsally the chitinous portion ceases at a 

 broadly curving line directly above the ventral slit. At this point 

 the body is enlarged to fit the interior of the host. 



The ratio of breadth at spiracles, that is, at the corner of the ven- 

 tral slit, to the distance between the mandibles is as 3.15 : 1. The 

 ratio of breadth at spiracles to distance from spiracles to apex is as 

 1.4:1. 



