JOUENAL OF ENTOMOLOGY AND ZOOLOGY 153 



P. conjuucta Alex, is Neotropical. Our very limited knowledge con- 

 cerning the life-history of members of this genus is confined to the 

 American form and this information may be given in the follow- 

 ing pages. 



Penthoptera albitarsis Osten Sacken. 



Penthoptera albitarsis Osten Sacken; Mon. Dipt. N. Am,, IV, 

 257, 1869. 



The adult of this fly is well-known and has a wide distribution in 

 the northeastern United States. This distribution so far as known 

 to me, is as follows : 



Vermont, Windham Co., Battleboro, July 15, 1908 (Johnson). 

 Massachusetts, Middlesex Co., Weston, July 23, 1911 (Johnson) ; 

 Plymouth Co., Plymouth, July 28, 1908 (Johnson). Connecticut, 

 New London Co., New London, Osten Sacken's type. New York, 

 Fulton Co., Sacandaga Park, alt. 800 feet, June 28, 1911 (Alexan- 

 der) ; Woodworth's Lake, alt. 1650 feet, July 19, 1914 (Alexan- 

 der) ; Tompkins Co., "The Glen," August 12, 1910 (Alexander) ; 

 Sept. 17, 1907 (Needham); Coy Glen, July 11, 1911 (Alexan- 

 der); Bool's Brook, July 13, 1912 (Alexander). New Jersey, 

 Essex Co.„, Hemlock Falls, June (Weidt) ; Warren Co., Delaware 

 Water Gap, July 11 (Johnson) ; Camden Co., Clementon, Aug. 7, 

 1892 (Johnson). Pennsylvania, (Cresson) Osten Sacken's type. 

 Virginia, Southampton Co., Boykins, June 10, 1895 (Johnson) ; 

 Nansemond Co., Suffolk, June 11, 1895 (Johnson); Fairfax Co., 

 Pimmit Run, Sept. 6, 1908 (Knab). North Carolina, Buncombe 

 Co., Black Mts., July 3, 1912 (BeutenmuUer) . Georgia, Rabun 

 Co., Tallulah Falls, June 21, 1909 (Bradley). 



From the above data it is seen that the fly is on the wing from 

 June until September, being most abundant probably in July. The 

 insects occur in cool, shady places and may be swept from the lux- 

 uriant vegetation growing in such locations. 



The larva differs widely from the related Hexatomine genera in 

 the habitat in which it dwells (in mud instead of sand and gravel) ; 

 in the bright yellow coloration and in structural details; the man- 

 dible with one very broad tooth at its middle, this tooth deeply split; 

 stigmal field surrounded by four rather short lobes, each of the 



