392 NEW YORK STATE MUSEUM 



4a Legs bearing many erect scales. Large species P s o r o p h o r a 



Legs without these scales (5) 



5 Thorax with metallic blue scales; small species; male with 



but a single curved claw on the middle leg; palpi of both 



sexes two jointed and short Uranotaenia (sapphirina) 



Thorax not so marked (G) 



6 " Hind feet black, their apexes snow white." Male palpi 



long, in the female short Conchyliastes 



Not as above (7) 



7 Palpi elongate (8) 



Palpi short (9) 



8 The fourth fore tarsal joint shorter than the fifth, about as 



long as wide. Palpi elongate and pointed Culex (males) 



Fourth fore tarsal, joint longer than wide. Male palpi 

 with enlarged apical joints Anopheles 



9 Small species with two jointed palpi; the second joint conical. . A e d e s 

 Medium sized species, with four jointed palpi, its apical joint 



cylindrical Culex (females) 



Of tlie southern genera, Megarhinus and Toxorhynchites may 

 be known by tbeir strongly curved proboscis and green and 

 bluish colors. Stegom^'ia resembles Culex, but has the thorax 

 marked with linee of silvery scales. 



Subfamily corethriisiae 

 Genus corethra Meigen 

 This genus together with Corethrella, Mochlonyx and Pelo- 

 rempis, nox. gen. forms the subfamily Corethrinae, which is dis- 

 tinguished from the remainder of the family by the comparative 

 shortness of the proboscis. There are but 15 or IG species in the 

 genus, four or five of which occur in North America. The life 

 history of some of the species has long been known. Some of 

 the works on the biology of Corethra are: 



1844 Staeger. Naturhist. Tidsskr. I. R. 2. B. 549, GOO. Corethra 

 f u sea. 



ISGG Weissmann, Dr A. Die ^letamorphose der C. p 1 u m i c o r n i s . 



1884 Herrick, A. Minn. Geol. Nat. Hist. Sur. p.lO. C. append!- 

 c u 1 a t a . 



1880 Meinert, F. De Eucephale Myggelarver, p.30 to 53. With bibliog- 

 raphy. 



Generic characters 



Usually delicate, moderate sized species of the appearance 



of a Chironomid, but distinguished by its many veined wing. 



Flead transversely oval, ei)istome somewhat projecting; pro- 



