383 



I. Protenthes stelIvATus Coquillett 



■— Tanypus sUUatus Coquillett, Proe. U. S. Nat. Mus., Vol. 25, 1902, p. 89. 



Pupa. — Thoracic respiratory organ broken. No discernible trans- 

 verse tubercles on disc. Apical abdominal appendages shaped as in 

 Figure 5, Plate XXIV, lateral margin of each with two long flat hairs. 



Imago; Male. — Similar to punctipcnnis, but differing as follows: 

 general color much darker, the palest parts brown ; spaces between 

 the vittae white pollinose; apices of abdominal segments narrowly- 

 white pollinose; legs marked as in punctipcnnis but the light and dark 

 portions more sharply contrasting; wings spotted in much the same 

 manner as in punctipcnnis, but the spots are very dark, almost black, 

 the most conspicuous being a large one covering the cross vein and 

 extending* well into the first posterior cell as w^ell as into the median 

 cell. In other respects the species appear to be very much alike. Hypo- 

 pygium as in Figure i, Plate XXVII. 



Female. — Similar in coloration to the male. 



Length, 2.5 mm. 



Illinois localities: Thompson's Lake, Havana, September i, 1910, 

 Urbana and Momence, July, 19 14, at light (all imagines) ; Matanzas 

 Lake, Havana, August 24, 1894 (pupa). 



Originally described from Texas, Kansas, and New York, and 

 recorded subsequently by Johannsen from Ithaca, N. Y. I have seen 

 specimens taken by Mr. Hart at Cedar Lake, Ind., July, 19 14. 



2. Protenthes punctipennis Meigen 



Tanypus punctipennis Meigen, Syst. Beschr., Vol. 1, 1818, p. 61; 9. 



Pw/'a.— Length, 5 mm. Very similar to pupa of Tanypus monilis, 

 differing principally in the structure of the thoracic respiratory organ 

 (PI. XX VI, Fig. 13) and in the shape of the apical appendages of the 

 abdomen (PI. XXVI, Fig. 4). 



Imago; Male and Female. — Yellow with a slight greenish or some- 

 times a brownish tinge. Head brownish, antennae and palpi yellow, 

 basal joint of the former sometimes brownish. Mesonotum opaque, 

 the three vittae pale brown, the whole surface gray pollinose ; scutel- 

 lum yellow ; pleurae yellow, wdth a brown spot below wing-base and a 

 large triangular spot of same color between fore and mid coxae ; post- 

 notum brown. Abdomen varying from yellow to brown, the anterior 

 margins of segments generally darker. Legs yellow, femora generally 

 with a brown preapical band, but sometimes in female with almost the 

 entire femur brownish and a yellow ring at about apical fourth ; tibiae 



