356 MEDICAL ENTOMOLOGY 



ten bristles on its upper surface, and five on its lower. Palpi cylindrical, 

 narrowing towards their bases ; proboscis completely retractile, and con- 

 cealed when in the resting position ; haustellitm as long as or longer than the 

 rostrum. The labial gutter is thickened, and the membraneous area between 

 it and the mentum diminished. The discal sclerite modified in shape from 

 that of Musca, and strongly chitinized ; the presto mat teeth greatly in- 

 creased in size and strength. The pseudotracheal membrane reduced in 

 extent and in the number of the channels. Thoracic chaetotaxy (macro- 

 chaetae): Humeral 4, the most internal bristle usually smaller than the 

 others ; post-humeral / ; notopleural 2 ; presiitural I ; supra-alar 7 ; intra- 

 alar 7 ; post-alar 3; dorsocentral 4 to 6, usually two to three anterior to 

 the thoracic suture, and two to three posterior to it ; acrostichal I ; 

 mesopleural 6 to 8, the space between the first and second greater than 

 that between any of the other two; sternopleural 3, arranged 1:2. Wings 

 Pale grey, yellowish at borders, costa with some black bristles at its base. 

 Venation as in Musca, except that the fourth longitudinal vein bends up 

 at a sharper angle. Reproduction oviparous, eggs large, laid, as far as is 

 known, all together in cow dung. Larva cylindrical, closely simulating 

 that of Musca ; piiparium also simulating that of Musca. 



This genus at the present time contains three species, one of which, 

 Philaematomyia lineata, is not a true biting fly. 



Philaematomyia lineata, Brunetti (Pristirhynchomyia lineata, Brunetti). 

 Thorax, ground colour silvery to dark grey, with four moderately broad 

 black longitudinal bands. Abdomen, first segment in male dark with 

 yellowish sides ; in female brown to black. Second segment in male 

 with a central dark brown longitudinal stripe, sides shimmering yellow, 

 with indistinct brown lateral bands ; in female with a well-marked central 

 longitudinal band, and the lower border edged with black. Third 

 segment, in male, with a median brown band, and lateral brown patches ; 

 in female with a narrow dark median stripe and triangular dark patches 

 at the sides. Fourth segment of male yellow at apex and brown at 

 sides ; in female yellowish with two indistinct dark lateral bands. 



This small dark fly, which may be easily mistaken for a species of 

 Musca, has been recorded from Madras and Calcutta ; it is a rare fly- 

 in Madras, and is most frequently seen in the cold weather ; some years 

 it is not met with at all. 



Philaematomyia gurnei, Fatten and Cragg (Plate XLVII, fig. 2). 

 Thorax, ground colour greyish black in the male, silver}- to yellowish 

 white in the female, always with four clove brown to black longitudina 

 bands. First segment of abdomen in male with sides and centre dark 



