202 DIPTERA OF NORTH AMERICA. [PART IV- 



tris, in which the larva dug longitudinal burrows. The latter 

 larva is the only one which has been described and figured in 

 detail. It is cylindrical, glabrous, of a livid gray, with a horny, 

 black head ; its structure is in no way distinguished from the 

 other larvte of the Tipulidse, as described in the Introduction to 

 this volume. I have already observed above (p. 4) that Mr. 

 Heeger's (Sitzungsber. d. Wien. Acad. Yol. XI) description of 

 the larva of Limnophila platyptera Macq. is evidently errone- 

 ous ; the larva is apparently that of Bolitop)hila. I may also 

 remark here that Limnobia p)latyptera Macq. quoted by Dr. 

 Schiner {Dipt. Austr. II, p. 5t2), among the unknown species 

 of doubtful location, cannot well be anything else but Limno- 

 phila hosj^es Egger (1. e. p. 554). 



Table for detarmlnlnrj the species. 



, ( Five posterior cells. 2 



(. Four posterior cells. 26 



fA supernumerary cross-vein in the second basal or in the first sub- 



„ j marginal cell. 3 



1 No supernumerary cross-vein in the second basal or in the first sub- 

 ^ marginal cell. 5 



£ A supernumerary cross-vein in the second basal cell. 4 



3 •? A supernumerary cross-vein in the first submarginal cell. 

 i 20 fuscovaria 0. S. 



r Antennae of the male much longer than those of the female. 

 I 3 fasciolata 0. S. 



I Antennae of the male not conspicuously longer than those of the female. 

 I- 19 aprilina 0. S. 



P ( Thorax shining black. 6 



( Thorax not shining black. 7 



„ ( Wings vpith large brown spots. 1 macrocera Sa;/. 



\ Wings not spotted. 22 munda, n. sp. 



(-Marginal cross-vein some distance from the tiji of the first longitudinal 



,. I vein. 8 



] Marginal cross-vein at the tip of the first longitudinal vein, which is 

 "^ incurved immediately beyond it. 18 



f Inner end of the second submarginal cell considerably anterior to 

 j the inner end of the first posterior cell. 9 



I Inner end of the second submarginal cell in a line with the first 

 ^ posterior cell, or almost so. 12 



/-Petiole of the first submarginal cell three or four times shorter than 



^ I this cell. 10 



I Petiole of the first submarginal cell nearly as long as this cell. 

 ^ IS ultima 0. S. 



