392 NEW YORK STATE MUSEUM 
4a Legs bearing many erect scales. Large species..... Psorophora 
Legs without these scales. ....0.06 cs. a s.5 «aso < ss tse fake er (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.......00.2.2.00200.0). ah eee (6) 
6 “Hind feet black, their apexes snow white.” Male palpi 
long, in: the: female pshortucs.- Ja. secant ater Conchyliastes 
NOU aS -ADOVE.. <b ek cae oe Poe ELS Cee ee ies Jee (7) 
7 Palpi elongate... 2. gS Woe Fees Oe oe tea ed ew ed Oe (8) 
Palpi ‘Short. .:. 2. c/ccratseiie hie d Qe oo bau as bt ee (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. enlarcéed apical joints: 2. s..< cg. 10 eh 2 acctae 6 Mere Anopheles 
9 Small species with two jointed palpi; the second joint conical..Aedes 
Medium sized species, with four jointed palpi, its apical joint 
CVU GIICHI... staat ect ete on. se rete ee ae eee eee ee Culex (females) 
Of the southern genera, Megarhinus and Toxorhynchites may 
be 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 cCORETHRINAE 
Genus CoRETHRA Meigen 
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 16 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, 600. Corethra 
fusca. 
1866 Weissmann, Dr A. Die Metamorphose der C. plumicornis. 
1884 Herrick, A. Minn. Geol. Nat. Hist. Sur. p.10. C. appendi- 
eu a tare 
1886 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- 
