392 NEW YORK STATE MLSEUM 



4a Legs bearing many erect scales. Large species Psoroplaora 



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^ (6) 



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



long, in the female short Conch yliastes 



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. I'alpi elongate and pointed Culex (males) 



Fourth fore tarsal, joint longer than wide. Male palpi 



wirli enlarged apical joints Anopheles 



S Small species with two jointed palpi; the second joint conical. .A ed e s 

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



cylindrical Culex (females) 



X)f the sonthfi-n jjeiiera, Mogarliimie and Toxorhynchites may 

 \>e known by their strongly curved proboscis and green and 

 bluish colors. Stegomyia resembles Culex, but has the thorax 

 marked with lines of silvery scales. 



Subfamily corethrinae 



Genus corethra ]\Ieigen 

 This genus together with Corethrella, Mochlonyx and Pelo- 

 rempis, nov. 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 1<] 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 ou the biologj' of Corethra are: 



1844 Staeger. Xaturhist. Tidsskr. I. R. 2. B. 549, 600. Corethra 

 I' U s (• ;i . 



ISOC) Weissmann, Dr A. Die Metamorphose der C. p 1 u m i c o r n i s . 



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

 c u 1 a t a . 



188(5 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. 

 Head transversely oval, epistome somewhat projecting; pro- 



