202 DIPTERA OF NORTH AMERICA. [PART IV. 



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

 larya 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 larvae of the Tipulidse, as described in the Introduction to 

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

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

 the larva of Limnophila platyptera Macq. is evidently errone- 

 ous ; the larva is apparently that of Bolitophila. I may also 

 remark here that Limnohia platyptera Macq. quoted by Dr. 

 Schiner {Dipt. Austr. II, p. 512), among the unknown species 

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

 phila hospes Egger (1. c. p. 554). 



., f Five posterior cells. 2 



I Four posterior cells. 26 



Table for determining the species. 

 ■lis. 



3llS. 



r A supernumerary cross-vein in the second basal or in the first sub- 

 o marginal cell. 3 



j 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. 



( 20 fuscovaria 0. S. 



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

 . I 3 fasciolata 0. S. 



i Antennse of the male not conspicuously longer than those of the female. 



*■ 19 aprilina 0. S. 



- ( Thorax shining black. 6 



( Thorax not shining black. 7 



fi | Wings with large brown spots. 1 macrocera Say. 



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



f Marginal cross-vein some distance from the tip of the first longitudinal 

 vein. 8 



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

 *■ incurved immediately beyond it. 18 



r Inner end of the second submarginal cell considerably anterior to 



9 



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 



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



this cell. 10 



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



18 ultima 0. S. 



