Studies on Tipulidae. 157 



Dolichopeza. 

 Curtis, Brit. Entomol. Diptera, Tab. 62; 1825. 



In the descriptions of this genus by previous authors one of the 

 principal characters, which distinguishes it from the other Tipulina 

 has not been mentioned: the total absence of the anterior branch of 

 the second vein; that short, usually oblique vein, the origin of which 

 coincides with the termination of the first vein in the second (comp, 

 my Monogr. of N. Am. Dipt. IV, p. 290, fig. 6, the vein l>.)- A 

 consequence of the absence of this vein is the absence of therhom- 

 boid cell, distinctive of the majority of Tipulidae. 



It is also worth noticing that in both european species of Doli- 

 cliopeza, the great crossvein is inserted a considerable distance be- 

 fore its usual place alongside of the discal cell (compare the figures 

 by Mr. Mik, Verh. Z. B. Ges. 1869, Tab. 4, f. 10. 11). 



The antennae are described as 12-jointed by Curtis, Meigen, 

 Zetterstedt and Walker. Schiner thought that he could count 

 13 joints. He was right, as I had an opportunity to ascertain on 

 living male and female specimens; the last Joint is very minute. 



The spurs at the end of the tibiae, not mentioned by the authors, 

 are exceedingly minute, hidden among hairs; more distinct on the 

 bind legs only. 



The rostrum is short, without nasus; a tuft of hair in its 

 place. 



The forceps of the male is more incrassate than that of Me- 

 gistocera or Tanypremna ; its structure seems to show some analogy 

 to that of Fachyrrhina. I had öccasion to observe the copula (in 

 Heidelberg, July 26); the female was hanging down from some Sup- 

 port to which it held on by its front legs; it bore the whole weight 

 of the male, who was fastened to it merely by the forceps, hanging 

 head downwards, with bis legs stretched out. I have seen Bittaco- 

 morpha copulate in the same manner. 



Two european species (Z>. sylvicola and nitida Mik) and one 

 from Madagascar {D. malagasya Karsch) have been described. 



Tipula annulata Say, Compl. Wr. II. 350 is related to Do- 

 lichopeza, but has a discal cell and shows some other differences; 

 some other undescribed american species, provided with discal cells, 

 likewise belong here, but have never been described (compare 0. Sack. 

 Catal. N. Am. Dipt. 1878). 



