DIPTERA. CULICIDZ — TIPULIDA. 125 
of the head, concealed in a cavity behind the eyes when at rest, and 
as long as the head, 4-jointed;” but other species introduced into the 
genus are described by Curtis as differing entirely in this respect; hence 
the character, derived from the antenne, appears to me to be merely spe- 
cific. Some of the species, however (P. vespertilionis and elongatus), 
being of a much more slender general form, I have proposed for them 
the generic name of Ischnopsyllus (Ent. Mag. No. 4.). 
Orver XIII. DIPTERA Aristotle. (ANTLIATA Fabricius. HALTERIP- 
TERA Clairv.) 
Sect. I. Crrnarora Westw. (See Vol. II. pp. 505. and 506.) 
Division 1. (Stirps 1.) Nemocera Latr., Mach. (Tipularize Meig.) 
Fam. 1. CULICID Leach. Culicides Macq. H. N. Dipt. 
CULEX Linn. ———— 20sp. C. pipiens Meig. Curtis, 537. 
Palpi longer than theproboscis 3, very short ?. 
ANOPHELES Meig. Cutex p. Linn. 3 sp. Cul. bifurcatus Linn. Curt. 210. 
Palpi of equal length with the proboscis in both sexes. 
JEDES Hoff., Meig. ———— 1 sp. 4d. cinereus? Hoff. Meig. Abb. 3. f. 1. 
Palpi very short ¢, pointed and thick at the base 9. 
Family 2. TIPULIDZ Ueach. (Tipulides Macq. H. N. Dipt.) 
Subfamily 1, Chironomides Westw. (Culiciformes Latr., Macq.) 
CORETHRA Meig. Cutronomus p. Fab. 3 sp. Ch. plumicornis Fab. 
Antenne ¢ plumose to the tip; legs placed at equal distances apart ; sternum 
not prominent. Steph. pl. 42. f. 1. 
CHIRONOMUS* Meig. Tieuta p. Linn. 91 sp. C. plumosus L. Curtis, 90. 
Four hind legs at a distance from the others; sternum prominent; last joint 
of g antenne longest. (My fig. 124. 8.) 
TANYPUS Meig. Cutronomus p. Fab. 26 sp. T. monilis Linn. Curtis, 501. 
Antenne 14-jointed in both sexes, penultimate joint longest; sternum promi- 
nent ; four hind-legs wide apart. 
SPHZROMIAS Steph. —— 6sp. Sph. albomarginatus. Curtis, 285. 
Antenne slender, basal joint globular, eight following joints short, five terminal 
joints long ; eyes emarginate; trophi fully developed. 
CERATOPOGON Meg. Cutronomus p. Fabr. 18sp. C. Stigma Meig. 
Antenne ¢ plumose at the base, 5 terminal joints elongated, simple in ?; all 
the femora simple; second joint of palpi longest; legs of nearly equal 
length ; two submarginal cells. Meig. Zw. 1. pl. 2. f. 18. 
PALPOMYIA Meig.?, Steph. CrERratorocon B. Meig. 10 sp. C. spinipes Meig. 
Differs from Ceratopogon in having the fore thighs thick and spinose beneath. 
Pz. 103. 14. 


* Our lakes and greater rivers yield a species remarkable for its wings incum- 
bent, as in Ceratopogon; but with the other characters of the genus, Ch. lacustris, 
dilute prasinus thorace vittis $ ferrugineis; tibiis anticis subfuscis (alis nudis ; 
halteribus albidis). Long 2 lin. 6 —1} 9. (Haliday MSS.) 
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