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American Midland Naturalist Monograph No. 3 



LARVA. (Fig. 79). — Head broader than long. Antenna about as long as 

 head, spinose; antennal tuft barbed, 5-branched, inserted a little beyond middle 

 of shaft and reaching tip. Head hairs: Preantennal (A) multiple, barbed, 

 reaching to insertion of antennal tuft; lower (B) double or triple, sparsely 

 barbed, extending slightly beyond preclypeus; upper (C) double, sparsely 

 barbed, extending to or slightly beyond preclypeus; postclypeal (d) small, 

 multiple; sutural (e), trans-sutural (f), and supraorbital usually double or 

 maltiple. Upper lateral abdominal hairs multiple on segments I and II, variable 

 on III to VI. Comb of eighth segment of about seven thorn-shaped scales in a 

 V-shaped row, the median scales much larger and longer than the outer scales; 

 individual scale with subapical spines only about one-fifth to one-fourth as long 

 as apical spine. Siphon only slightly inflated, about four times as long as basal 



Fig. 79. Larva of Psorophora varipes (Coquillett). A, Terminal 

 segments. B, Pecten tooth. C, Comb scale. D, Head. 



