120 ENTOMOLOGY FOR MEDICAL OFlFlCEfeS 



than a third the length of the wing. Himalayas, between 

 4000 and 7000 feet. 



P. perturbans, Meijere. Head and thorax yellowish-brown, 

 abdomen brown with darker glistening hairs ; femora yellow 

 with brown tip ; tibiae and tarsi brown with silver sheen. 

 Greatest breadth of wing one-third its length ; greatest length 

 of 2nd marginal cell a little more than one-fourth the 

 length of the wing. Batavia. 



P. angustipennis, Meijere, from Netherlands India is 

 thought by Annandale to be synonymous with P. papatasii, 

 Rondani. The wings are long and narrow, and the 2nd 

 marginal cell is barely a third the length of the wing. 



4. American Species. 



P. vexator, Coquillett Yellow ; mesonotum brown ; legs 

 appear brown in certain lights, but are covered with white 

 tomentum ; 2nd marginal cell slightly over twice the length 

 of its petiole. North America. 



P. cruciatus, Coquillett. Like P. vexator, except that the 

 hairs are chiefly yellow, and the 2nd marginal cell is 

 about thrice the length of its petiole. Guatemala. 



Family Chironomid^ : MiAg&s par excellence 

 (Gr. -xeipovo/jLOi = one who gesticulates with the arms). 



Chironomidce are .typical midges many of which greatly 

 resemble mosquitoes ; but they can be distinguished, apart 

 from other characters, by the proboscis, the wings, and the 

 pose : the proboscis is short — even in the females of the 

 blood-sucking species, which do not resemble mosquitoes, it is 

 not very long ; the wings are not scaly, though they may be 

 hairy, and the costal vein stops at the tip of the wing ; and 

 in repose the front legs are usually uplifted — ^whence the 

 name Chironoinus. The antennae of the male are thickly 

 plumose, those of the female may be either short or long; 

 the thorax generally projects a good deal over the back of 

 ^the head; the wings are either bare or hairy, the anterior 

 veins are usually thicker and darker than those in the 

 posterior part of the wing, the 2nd longitudinal vein is 

 wanting — and often the posterior cross-vein also — and the 



