370 MEDICAL ENTOMOLOGY 



length ; the fourth segment of the male has no lateral spots, and the first 

 longitudinal vein has only one or two spines at its base. 



It is found in Northern India, at Kasauli in the Western Himalayas, 

 and at Darjeeling in the Eastern Himalayas. It feeds on cattle and 

 horses ; its early stages are unknown. 



GENUS BDELLOLARYNX, AUSTEN 



Medium-sized flies of a mouse grey, greenish or brownish grey 

 colour, very closely all ted to Haematobia, with which the only species may 

 be confused. Body robust, and head in profile similar to that of Hae- 

 matobia. No sexual dimorphism, except perhaps in the male. Frons in 

 male one-eighth to one-ninth total width of head ; in female one-half 

 total width of head. Arista with eleven long bristles on its upper surface, 

 and five on its lower. Palp club-shaped, and as long as the proboscis. 

 Thorax covered with small bristles as in Haematobia, and with four 

 very narrow longitudinal stripes. Thoracic chaetotaxy (macrochaetae) : 

 Humeral 2 ; posthumeral 1 ; notopleural 2 ; presutural I : supra-alar 1 ; 

 intra-alar 1 ; post-alar 2 ; dorsocentral 5, two of which are in front of the 

 suture and three behind; acrostichal 1 or 2; mesopleural 10 to 12; 

 sternopleural 2, arranged : 2. Abdomen yellowish brown, with a median 

 longitudinal brown band, and lateral brown patches ; wings grey, tawny in 

 male. Fourth longitudinal vein curving upwards less abruptly than in 

 Haematobia, and the first posterior cell broadly open ; first and third 

 longitudinal veins without bristles at their bases. 



The only species, Bdellolarynx sanguinolentus, Austen, (Plate XLYIII, 

 fig. 2) though very closely allied to Haematobia, may be distinguished 

 as follows : By the absence of sexual colour dimorphism, and by the 

 longitudinal bands on the thorax being narrower ; by the broader frons of 

 the male ; by the number of bristles on the arista, and by the absence of 

 spines on the bases of the first and third longitudinal veins. Bdello- 

 larynx sanguinolentus is found in many parts of India, and has been 

 recorded from Bombay, Calcutta, and Mussoorie ; Allahabad, Nepal, 

 Sylhet, Lower Burma, Travancore and Ceylon. One of the writers 

 collected some hundreds of specimens at Kodaikanal (6,000 ft.) Pulney 

 Hills, South India. 



Both sexes are voracious blood-suckers, and feed on cattle and horses. 

 Like Philaematomyia insignis, they can be readily caught in the fingers. 

 The male has the habit of hovering under the belly of the host, or near 

 small twigs and branches, remaining in the air for a few minutes and 



