Mar., 1908. | New Species of Gnats. 9 



the length of the caudal branch of the radius, its hind margin at the small cross vein 

 and extending slightly proximad after crossing the medius ; veins dark where crossed 

 by band, radius continuing rather dark to the margin ; whole of costa light brown. 

 Length (without abdomen) \ l / 2 mm. Wing length 2|£ mm. 



One specimen. Taken at Cabin John, Md., June 3. 

 Type. — Cat. No. 11021, U. S. N. M. 



Chironomus hirtipes, new species. 



Male. — Antennal joints and hairs smoky, except the first two segments which 

 are tan ; vertex and mouth parts tan. Mesothorax rather dark tan, with slight prui- 

 nosity, the lateral vittae light brown, the central rather pruinose continuing in a brown 

 line to the scutellum, a black line running along its lateral margins from the cephalic 

 margin of the mesonotum to the scutellum and spreading in the middle of its length 

 into a distinct triangular dot ; scutellum dark brown, with black spots at its lateral 

 margins ; metathorax dark tan, with faint black spots on its cephalic margin ; 

 pleura; and coxae tan-brown. Wings uniformly smoky except at the very base, which 

 is white. Abdomen deep cream or pale tan, lateral brown dots on the first segment, 

 brown basal bands on succeeding segments until the last two are entirely dark brown 

 and tan. Venter tan. Femora and tibia; (fig. 12) tan with thick covering of dark 

 brown, long hairs, which give a decidedly fuzzy appearance, last two tarsal joints 

 light tan, rest cream. Length 5 mm. Wing length 4 mm. 



Three specimens. Taken at Cabin John, Md., June 3. 

 Type. —Male, Cat. No. 11024, U. S. N. M. 



Female. — Vertex of head light tan, antenna; same ; mesothorax tan, lighter than 

 in male, with more pruinosity as are also the vittae ; the line on each side of the cen- 

 tral vitta brown ; pleurae dark brown, with slight pruinosity and light brown mott- 

 lings ; scutellum dark tan ; metanotum tan shading into two chocolate brown dots on 

 its cephalic margin ; wings with slightly more white at base than in male ; halteres 

 straw color ; abdomen ashy, with creamy hairs, on second and all succeeding seg- 

 ments a basal band of chocolate brown which narrows until it practically disappears 

 on the last, venter very dark brown ; coxae tan ; femora and tibia 1 tan, with rather 

 thickly set brown hairs but not nearly so fuzzy in appearance as those of the male ; 

 first three joints of tarsi creamy, rest pale tan. Length 3.5 nun. Wing length 3.5 nun. 



Three females taken with the males at Cabin John. Specim 

 have also been taken at Ft. Porter, N. Y., on July 3. 



Cotype. — Female, Cat. No. 11024, U. S. N. M. 



The insects when resting, as is their habit, on the under side of 

 leaves, much resemble little spiders and would scarcely be noticed by 

 one looking for gnats. They are rather more stupid and easy to cap- 

 ture than the average. Although not found in swarms they were 

 locally quite abundant. The females taken at Cabin John laid eggs 

 June 4, about 700 being embedded in a round mass of gelatin. 

 The eggs hatched June 7, but the young larvce all died. 



