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 Avith metallic blue scales; small species; male Avith 



but a single curA^ed claw on the middle leg; palpi of both 



sexes two jointed and short U r a n o t a e n i a (s a p p h i r i n a) 



Thorax not so marked ((]) 



6 " Hind feet black, their apexes snow AA'hite." Male palpi 



long, in the female short Conchy Hastes 



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 Avide. Palpi elongate and pointed C u 1 e x (males) 



Fourth fore tarsal, joint longer than AA'ide. Male palpi 

 AA'ith enlarged apical joints Anopheles 



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

 Medium sized species, AA'ith four jointed palpi, its apical joint 



,' i-ylindrical C u 1 e x (females) 



Of the southern genera, Megarhinus and Toxorhynchites may 

 be known by their strongly curA'ed proboscis and green and 

 bluish colors. Stegomyia resembles Culex, but has the thorax 

 marked Avith \meci of silvery scales. 



Subfamily corethritsiae 

 Genus corethra Meigen 

 This genus together with Corethrella, Mochlonyx and Pelo- 

 remjiis. noA'. gen. forms the subfamily Corethrinae, which is dis- 

 tinguislu d from the remainder of the family by the comparative 

 shortness of the proboscis. There are but 15 or 16 species in the 

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

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

 the Avorks on the biology of Corethra are: 



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

 f u sea. 



18(Ii'> 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 . 



188G Meinert, F. De Euc(>phale 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- 



