AQUATIC INSECTS IN THE ADIRONDACKS 587 



Family 77 alysiidae 



BRACHYSTROPHA Forstei 



Brachystropha quadriceps sp. nov. 



$ Length 1.8 mm. Polished black ; mandibles rufous, palpi white; 

 antennae black, 23 jointed, the scape beneath reddish, the extreme apex 

 of the pedicel yellowish white ; legs flavo-testaceous, the tibiae and tarsi 

 darker, more of a reddish color, the tarsi fuscous. Wings hyaline, iri- 

 descent, the stigma and veins dark brown, the stigma subtriangular in 

 shape, wider than the first abscissa of the radius and scarcely extending 

 to half the length of the marginal cell. 



The head is quadrate, with the temples broad, full, the face below the 

 antennae smooth, impunctate, but with a delicate median ridge. The 

 median fovea on the mesonotum posteriorly, so conspicuous in many 

 forms, is very minute, nearly obsolete. The scutellum is bifoveate at 

 base. The metathorax is rugulose, bare, but with a median carina. The 

 mesopleural suture is distinct, crenate. The abdomen is clavate, the 

 petiole being long and striate with prominent spiracles, the following 

 segments all smooth, shining. 



Type. Cat. no. 5366, U. S. national museum 



Habitat. Saranac Inn ; N. Y. One specimen in July by Prof. 



James G. Needham. 



RHizARCHA Forster 



Rhizarcha astigma sp. nov. 

 $ Length 2 mm. Polished black; mandibles rufous; palpi white; 

 antennae black, 24 jointed, the scape and pedicel rufo-piceous, the latter 

 narrowly yellow at apex; legs rufo-testaceous, the coxae and trochanters 

 paler, more or less pale yellowish; wings hyaline, the veins brown. 



The face below the antennae is feebly punctate and with a short 

 median carina. The mesonotum posteriorly has a median fovea and a 

 short grooved line just in front of the scutellum. The scutellum is 

 bifoveate at base. The metathorax is rugulose but so densely clothed 

 with a pale pubescence as to be obscured and the sculpture overlooked. 

 The stigma in the front wings is not developed, being narrow and linear 

 as in Aspilota. The mesopleural suture is distinct but smooth, not 

 at all crenate. The abdomen is oblong oval, scarcely as long as the 

 head and thorax united, the ovipositor not prominent, at the most sub- 

 exserted, the first segment longitudinally striate, those beyond smooth 

 and shining. 



