546 PROCEEDINGS OF THE ACADEMY OF [Oct., 



ranging from Maine, New Hampshire and Vermont south (in the 

 mountains) to Mt. Toxoway, North Carolina, the type-locality. 

 In New York and New England it flies from June 11 to August 31, 

 being quite numerous in suitable localities throughout the latter 

 half of June and all of July. It is found in cool, shady spots, usually 

 near running water or springs, being very often found in small dark 

 ravines or along shaded runs. They frequently lurk under dark 

 culverts after the fashion of Dolichopeza and Oropeza. 

 Bittacomorpha (Bittacomorphella) sackenii Roder. 



Northwestern United States and western Canada, ranging from 

 Queen Charlotte Isle, British Columbia, south to California and 

 east to Colorado. The records indicate that the insect is on the 

 wing in June and early July. 



The species of Bittacomorpha may be separated by the following 

 key: 



1. Wings with the apical cells without a strong pubescence; meta- 



tarsi swollen and white basally. (Subgen. Bittacomorpha.) 2 



Wings with the apical cells with a sparse strong pubescence; 

 metatarsi not swollen, and without white near the base. 

 (Subgen. Bittacomorphella.) 3 



2. Dorsum of thorax deep velvety black with a white median line; 



cell Ra of the wings one-third as long as R b . (Eastern North 



America.) clavipes Fabricius. 19 



Dorsum of thorax shiny black without a white median line; cell 

 Ri of the wings one-half as long as R&. (Western United 

 States.) occidentalis Aldrich. 20 



3. Tibia? and metatarsi dark brownish black without white (except 



the extreme tip of the latter in some specimens), segments 

 two and three of the tarsi pure white. (Western North 



America.) sackenii Roder. 21 



Tibiae black with a broad white band beyond the base; metatarsi 

 with more or less white at the tip, broadest on the fore legs, 

 narrowest on the hind legs; segments two and three of the 



tarsi pure white. (Northeastern United States.) 



jonesi Johnson. 22 



Explanation of Plates XXV to XXXI. 



Plate XXV. — Fig. 1. — Wing of Geranomyia canadensis West wood. 

 Fig. 2. — Wing of G. distincta Doane. 

 Fig. 3. — Wing of G. intermedia Walker. 

 Fig. 4. — Wing of G. diversa Osten Sacken. 

 Fig. 5. — Wing of G. tibialis Loew. 



19 Tipula clavipes Fabricius; Spec. Insect., vol. 2, p. 404 (1781). 



20 Bittacomorpha occidentalis Aldrich; Psyche, vol. 7, p. 201 (1895). 



21 Bittacomorpha sackenii Roder; Wien. Entom. Zeit., p. 230 (1890). 



22 Bittacomorpha jonesi Johnson; Psyche, vol. 12, pp. 75, 76 (1905). 



