Mar., 1908.] 



Mitchell : New Species of Gnats. 



11 



which is prolonged as a brown line to the scutellum, is divided by a creamy line on its 

 cephalic half. Pleura entirely brown ; caudal part of scutellum brown ; metanotum 

 much darker than in male. Abdomen with long silvery hairs, first three segments 

 pea green, with dark, indefinite, mesal marking becoming quite pronounced on the 

 fourth, spreading into a basal band, slight on the fifth, which segments are silvery 

 pruinose on sides, apical third of segments three to five greenish white, basal half of 

 the seventh and eighth segments black and their apical halves greenish white. These 

 dark markings are very variable and may be confined to the last two or three segments. 

 Femora as in male, the band very pronounced, proximal half of first, third of second 

 and two thirds of third tibia; (except for a light spot just distad of knee) dark brown, 

 the rest creamy, the articulation with the tarsi black as also the articulations of the 

 tarsi and claws. Hairs not so long as on the legs of the male. Entire venter of the 

 abdomen dark instead of corresponding with the dorsal markings as in the male. 

 Length 4.5 mm. Wing length 4 mm. 



Cotype. — Female, Cat. No. 11023, U. 

 S. N. M. 



There were six males and two females 

 taken at Cabin John, Md., June 6. Both 

 females laid eggs the tenth. They were 

 about 200 in number and arranged ir- 

 regularly in a rounded mass of gelatin about 

 3.5 mm. in diameter (fig. 8). The outer 

 coat of the gelatin has a peculiar appearance 

 under the microscope, as if of myriads of 

 short lines directed toward the center of the 

 mass. The larvse were hatched June 11, 



Fi<;. 8. Egg mass of ( 

 lopterus. 



and the last died July 29. They make 



houses on the bottom of the jar from grains 



of sand and bits of Spirogyra, using rather large bits of sand. 



Chironomus exquisitus, new species. 



Male. — Antennal joints dark, except first, which is tan colored ; hairs of 

 antennae cream colored on proximal three fourths of antennae and cinereous on distal 

 fourth ; occiput creamy. Mesonotum ptactically white (probably green in life) the 

 vittae brown, bordered by golden brown, the anterior ones distinctly divided into two ; 

 pleura pale brown ; scutellum white ; metanotum black divided by white line at 

 meson. Last four abdominal segments and claspers black with fainl tan mottlings, 

 fifth segment black on distal, yellow on proximal, half; rest of abdomen nile green ; 

 the whole covered with long, straw-colored hairs. Wings (fig. 9, c) hyaline, the 

 costal cell clear, tip cinereous, this color extending over a little less than the distal 

 fourth of the wing, a narrow cinereous band at cross vein extending from K to caudal 

 margin and along the latter about as far as the anal vein. I egs (fig. 1 : cox.e 

 greenish white ; femora white except for black band occupying about the distal fourth 

 (a little more on the last two pairs than on the first), about the proximal fourth U the 



