^3 



765. 

 SIMULIUM TRIFASCIATUM. 



Order Diptera. Fam. Tipulidse. 



Type of the Genus, Culex sericea Linn. 



SiMULiuM Lat., Macq., Curt. — Simulia Meig. — Atractocera Meig, 

 — Culex Linn., Fab. 



Antennce inserted at the base of the clypeus, approximating, 

 porrected, very short, stoutish, somewhat filiform, pubescent, 

 11-jointed, 1st and •2nd joints somewhat sepaiated from the 

 others, 3 basal joints the largest, cup-shaped, 4 following 

 shorter and bowl-shaped, remainder more glol)ose, apical joint 

 elongate- ovate (3). 



Lcibrum rather short broad and linear, the apex rounded and 

 ciliated (b). 



Tongue shorter, broad and rounded at the apex (c). 

 Mandibles spatulate lancets, slender and curved at the base, the 

 apex ovate id). 



MaxillcE nearly as long as the labrum, sublanceolate, the apex 

 not acute (e). Palpi nearly thrice as long, exserted, incurved, 

 pubescent, pilose and 4-jointed, basal joint short, 2nd large, 

 stout, elongate-ovate, 3rd not quite so large, obovate, 4th very 

 long, slender, subcylindric, a little dilated at the base (/). 

 Lip short, deeply cleft, forming 2 rounded and slightly hairy 

 lobes (g). 

 Head small, subglobose, attached low down the thorax : eyes conti- 

 guous in the male (2 (^), coarsely granulated, excepting a portion of 

 the lower part, nearly covering the head, leaving only the clypeus in 

 front, which is very small : remote and internally emarginate in the 

 female (2 ? ) : ocelli none. Thorax globose, the back very much 

 elevated : scutel sublunate. Abdomen small, especially in the male, 

 and linear ; stouter and elongate-ovate in the females. Wings very 

 ample, broad and oval, incumbent and parallel in repose ? costal ner- 

 vures strong, the others very faint (9) ; halteres small, with a spoon- 

 shaped club. Legs moderate, very much compressed, anterior some- 

 times as long and as large as the hinder, which are often stout : 

 thighs moderate, not stout : tibiae dilated towards the apex, hinder 

 with minute spurs : tarsi 5 -jointed, tapering, generally thickened at 

 the base, excepting the intermediate ; basal joint long, 3rd small, 

 4th bilobed, 5th very slender, clavate : claws and pulvilli small, 



Trifasciatum Curt. MSS. — Guide Gen. 1176. 



Female cinereous ; 2 basal joints of antennse ochreous ; eyes 

 castaneous ; head and thorax black, sparingly clothed with 

 golden pubescence, the latter silvery before, divided by 2 ob- 

 lique black stripes ; abdomen carneous at the base, the first 3 

 segments with deep castaneous fasciae, each formed of 3 united 

 semiorbicular spots, apex with scattered golden hairs ; wings 

 iridescent, a little ochreous at the base, costal nervures brown ; 

 halteres yellow ; legs ochreous ; thighs brownish towards the 

 apex ; tibiae silky- white externally, especially the anterior, apex 

 fuscous ; tarsi black, excepting the base of the 4 posterior. 



hi the Author's Cabinet. 

 684. 



