!()() PROC. EXT. SOC. WASH., VOL. 21, XO. 5, MAY, 1919 



Segment IV with a sensorium and Segment V with a distal group. Cornicles, 

 chitinized rings on slightly elevated cones. Cauda and anal plate rounded. 



Alate form: Color yellowish with the appendages dusky and head and 

 thorax almost black. Wings with the veins shaded with brown. Antennae 

 (fig. 1C) as follows: I, 0.032 mm.; II, 0.048 mm.; Ill, 0.008 mm.; IV, 0.08 

 mm. ; V, 0.096 mm. ; VI, 0.08 mm. Segment III with twelve to fifteen narrow 

 transverse sensoria, IV with about five, V with about six and VI with about 

 five and with several almost distal, small circular fringed ones. In one 

 case a five segmented antenna was found (fig. ID). Wings (fig. IE) with 

 heavy veins. Forewing with the media atrophied for some distance toward 

 the base. Cubitus and anal arising very close together. Hindwing with 

 the second vien arising near the base and being long and slightly curved. 

 Cornicles mere rings slightly elevated, situated not on the margins of the 

 abdomen but distinctly on the dorsum 0.16 mm. apart. Cauda somewhat 

 conical. Anal plate rounded. 



Described from a number of cotypes, apterous and alate, on bal- 

 sam mounts, all these specimens reared by the writer, and de- 

 posited in the United States National Museum Collection. 



TWO NEW GENERA OF ANTHOMYIDAE (DIPT.). 



BY J. M. ALDRICH, Division of Insects, U. S. Nat. Museum. 



Pergandea, new genus. 



Sixth vein reaching margin of wing; hind calypters very narrow, more than 

 covered by the front ones. On these two characters the genus goes in An- 

 thomyinae, but differs from most of its congeners in having the scutellum 

 bare below, the cruciate frontal bristles of female minute and somewhat 

 vestigial, the vibrissae considerably above the oral margin but not approxi- 

 mated, front in male almost one-third the head width, female destitute of 

 cerci but with small thorns below on genital segment. Palpi and proboscis 

 normal, hind coxae bare behind, pteropleura and hypopleura entirely bare. 

 Third antennal joint hardly twice the second, the arista unique among Antho- 

 myidae known to the writer in being almost exactly that of Musca domestica 

 short but thin, greatly enlarged at base, with long and comparatively few rays 

 above and below (see figure). Lower hind part of head considerably swollen, 

 a deep groove behind the eye bounding this region upwardly. 



Type, Pergandia apivora, new species. 

 Pergandia apivora, new species. 



Yellow, the following parts black or blackish: thorax except apex of scutellum 

 and a few indistinct marks on sides, ocellar triangle and more or less of vertex 

 and back of head, third antennal joint, middle of proboscis, the U-shaped 



