GENUS CERATOPOGON 159 



developed than the others, and abutting the basal third of the wing 

 border ; third longitudinal vein reaching nearly to the point of the wing ; 

 fourth and fifth veins bifurcated : sixth and seventh not well developed. 

 Legs slender, coxae not elongated, spurs on the hind tibiae prominent, 

 those on the others weak; metatarsus elongated ; pulvilli absent. Ab- 

 domen elongated, consisting of seven segments ; ovipositor formed of two 

 club-shaped processes. 



This genus at present contains the single species T. torrens, Town- 

 send, which is found in North America, at a height of 7,000 feet ; it 

 bites horses and other animals, usually on the head, ears and eyes. 

 Its life history is not known. 



GENUS MYCTEROTYPUS, NOE 



Noe created this genus for the two species My. bezzii, and My. irritans 

 from the South of Europe, which are said to be voracious blood-suckers, 

 biting human beings as well as animals, and causing inflammatory 

 swellings. A. Weiss has recently described another species My. laurae 

 from North Africa. According to Kieffer it is not quite certain whether 

 the genus Mycterotypus is a good one; further observations on the 

 species may show that they belong to one of the other genera of the 

 Ceratopogoninae. 



GENUS CERATOPOGON, MEIGEN 



Head somewhat flattened in front, and prolonged into a moderately 

 long proboscis. Antennae of fourteen segments in both sexes ; first 

 segment large and shaped like a flattened sphere, the succeeding 

 eight or ten oval in shape, and in the male furnished with Jong plu- 

 mose hairs ; in the female the hairs, which may be long or short, are 

 verticillate. The last segments are more elongate and have short hairs. 

 Thorax strongly arched, but never produced above the head. Wings 

 held in a horizontal position in repose, and usually rough owing to the 

 presence of small hairs closely applied to the surface; third longitudinal 

 vein either joined to the subcostal by a transverse vein, or united to it in 

 part or the whole of its length. The fourth longitudinal vein is forked 

 and joined to the third by a transverse vein. The fifth is also bifur- 

 cated, and there is often a forked vein, free at its basal end, between 

 the third and fourth veins. The sixth and seventh veins are rudiment- 

 ary. The legs are strong and of moderate length ; the femora are 

 neither spined nor swollen ; the hind metatarsus is longer than or 

 equal in length to the succeeding joint ; the claws are simple and 



