Pipizella. 57 



boscis somewhat short. Labrum somewhat strong, seniitubular, the 

 median process narrow, cleft and the apices diverging, and each 

 branch with spine-like emergences; the lower lateral process the longest, 

 rather broad, somewhat pointed and with the apex directed inwards; 

 the upper lateral process is shorter and very thin and delicate; along 

 the lateral margin on the inside labrum has a row of small warts. 

 Hypopharynx of the length of labrum, somewhat blade-shaped, rounded 

 at the end. Maxillæ with a short, lancet-shaped lacinia, and a cylin- 

 drical, somewhat club-shaped palpus of the same length; it has some 

 bristles and is beset with microscopical hairs; the lacinia very densely 

 beset with still smaller hairs. Labium with the well chitinised basal 

 part about as long as the broad labella, it is triangularly incised in 

 front. Thorax nearly quadratic, somewhat densely hairy. Scutellum 

 black, with a row of marginal hairs below. No bristles present. 

 Metapleura with short hairs. Abdomen elongate, flattened, with nearly 

 parallel sides ; on the sides of the segments more or less slight, arched 

 elevations; on the venter there is a small chitinisation at the base, 

 the first ventral segment otherwise more or less slightly chitinised. In 

 the male abdomen has four not transformed segments, the first quite 

 short, the second longest, the third and fourth shorter, of equal length. 

 Genitalia forniing a small knob ; they are turned to the right, bent in 

 under the venter and with the end hidden under the fourth ventral 

 segment; the ninth segment together with its appendages not long; 

 in Heringi the genitalia are larger. In the femalo there are five 

 visible segments, the fifth small, and three hidden, forming an ovi- 

 positor ending with two small styles. Legs not long; hind metatarsus 

 a little thickened. The anterior femora have long hairs on the posterior 

 side and the hind femora on the anterior side; hind tibiæ with a 

 fringe above; below the apical part of the front and hind tibiæ and 

 the tarsi the usual short, adpressed pubescence. There are two claws 

 and pulvilli, and a short, linear or bristle-shaped empodium with small 

 bristles. Wings not long, about as long as abdomen ; medial cross- 

 vein before the middle of the discai cell; the upper marginal cross- 

 vein starting rectangularly below, bent before the middle and with 

 the upper part more or less curved, the upper angle about rect- 

 angular; in Heringi the upper part of the vein sloping outwards, the 

 upper angle acute. Vena spuria weak. Alula well developed. Plumula 

 not short, with hairs whicli are slightly branched from the base. Alar 

 squamulæ with longish, simple hairs, thoracai squamulæ with long, 

 furcately divided hairs. 



The developmental stages of P. virens (varipesj are described by 

 Heeger (Sitzungsber. d. kais. Akad. d. Wissenschaft. Wien, Math. Nat. 



