205 



small but distinct elevated tubercle immediately behind antennal base. 

 The usual 6 small elevations on dorsum of thorax, the medio-dorsal 

 pair duplicated transversely; wings extending to apex of second ab- 

 dominal segment; legs extending beyond apex of third, terminating in 

 a straight transverse line. All dorsal segments except apical one with 

 a transverse series of thorns on or near posterior margin, the series 

 becoming successively stronger from basal segment to apical ; post- 

 notum with 4 very small protuberances ; third and fourth ventral 

 abdominal segments each with 2 widely separated thorns, fifth to 

 eighth inclusive with 4 each; prespiracular and postspiracular spines 

 of equal strength, both simple ; apical segments of male and female 

 as in Figures 16, and 17, Plate XXXII. 



The foregoing description was made from exuvia supplied by 

 Dr. E. P. Felt and J. A. Hyslop, the former obtaining his specimens 

 at Albany, N. Y., May 5, 1909, and the latter obtaining his at Wolf- 

 ville, Md., May 21, 1915. The species is represented in the Labora- 

 tory collections by two imagines from Algonquin, 111. 



TiPULA sERTA*Loew? 

 Tipula serta Loew, Berl. Ent. Zeitschr., 1863, p. 283. 



Pupa. — Length, 30 mm. Yellowish brown. Robust. Head with 

 a pair of small rounded elevations above and between bases of an- 

 tennae; antennae without a distinct basal process. Thoracic respira- 

 tory organs less than 6 times as long as their greatest width ; post- 

 spiracular protuberances in the form of rounded elevations ; medio- 

 dorsal pair carinated, simple ; tarsi terminating in a straight trans- 

 verse line at apex of third abdominal segment. Armature of ventral 

 abdominal segments confined to posterior margins, that of third and 

 fourth segments consisting of 2 thorns, that of remaining segments 

 of 4; laterad of the thorns on each segment are 2 slender bristles; 

 apical segment much elongated (PI. XXVIII, Fig. 8). 



The foregoing description was made from the pupal exuvium of 

 a female that was reared from a larva found by the writer under a 

 log at White Heath, 111., in March, 191 6 (Ace. No. 46302). 



Owing to the great uncertainty in identifying species of this ge- 

 nus from descriptions, the above name should be regarded as a tenta- 

 tive one. 



TiPULA BicoRNis Forbes 



Tipula bicornis Forbes, 16th Eep. State Ent. 111., p. 78. (1888) 



This species was originally described by Dr. Forbes, as above 



