396 



tion similar to that of Protcnthcs (PI. XXVII, Figs. 2, 5), differing 

 in the absence of the fork at apex of first vein; cubitus forking about 

 as far beyond cross vein as the length of that vein. 



Length, 4.5 mm. 



Locality, South Haven, Mich., July 14, 1914, on shore of Lake 

 Michigan (C. A. Hart). 



This species resembles Diamesa waltlii in color and size, but differs 

 in venation and in having the fourth tarsal joint linear. 



The foregoing description differs from that given by Coquillett 

 in color of legs, an unimportant detail, and as the original description 

 is very brief it is not possible to identify the present species with ab- 

 solute certainty. 



Originally described from Colorado, and subsequently recorded 

 from New Jersey by Johnson. 



CcELOTANYPUs Kieffcr 



The genus drlotanypus is a rather arbitrary one, and its status 

 could readily be questioned, since the species which have a short petiole 

 to the cubitus show so much variation in its shortness that I should 

 expect the petiole to be absent in individual cases. I have found it a 

 general rule in Diptera, as well as in other orders, that where the 

 petiole of a vein is very short, or where two veins meet another vein 

 in close proximity to each other, the tendency is to considerable varia- 

 tion in the comparative length of the short portions of the veins in 

 different specimens, or even on the wings of the same specimen. This 

 genus is retained here more for convenience and a desire to avoid 

 confusion than because I consider it entitled to separation from Pro- 

 cladius. Johannsen suggested in his paper on this group in 1905 that 

 tricolor belonged to Anatopynia, but in 191 3 Kieffer erected the 'genus 

 Carlotanypiis for this species and humeralis Loew, the basis of separa- 

 tion being the shape of the fourth tarsal joint. Anatopynia as re- 

 stricted by Kieffer does not occur in North America, Johannsen having 

 indicated as the type of the genus Tanypus plimiipes Fries, a European 

 species not known to occur in North America. 



CCULOTANYPUS TRICOLOR LoCW 

 Tanypus tricolor Loew, Berl. Ent. Zeitschr., 1861, Vol. 5, p. 309. 



Female. — Glossy yellow. Head slightly brownish. Mesonotum 

 with the vittse reddish or brownish, becoming black on the outer 

 margins; anterior lateral margins of mesonotum and anterior half of 

 pleurae creamy white but not so conspicuous as in scapularis; scutellum 



