Genus Grabhamia. 



311 



black at basal and apical third ; radius 4 and 5, black at apical two- 

 thirds ; media 1 and 2 black, beginning a short distance from base and 

 extending to cross- vein, black again a little on each side of fork with 

 media 3, and again at margin ; media 3 black at both ends. Cubitus 1, 

 black, beginning a short distance from base and extending to fork with 

 cubitus 2, white for a short distance, then black to cross-vein, and again 

 at margin ; cubitus 2 slightly black at tip and anal vein black at apical 

 fourth. The black at the forks, radius 2 and 3 and media 1 and 2 and 3 

 are so close together that they appear as distinct spots." 



Observations, — This species has been bred from larvae. 

 Nothing is known of the habits of the adult, or whether or 

 not it bites. The larvae were taken by Mr. William P. Leal 

 in June and July at Delair, N .J. The pupae formed on June 

 23rd and 24th and imagines hatched on 

 the 27th and 28 th — a pupal period of 

 four days. The second lot (July) re- 

 ceived by Professor Smith did not thrive, 

 one hatched out on August 8th. The 

 larvae are noticeable by their white 

 antennae which are very prominent, by 

 their long thin anal gills, and by their 

 habit of resting on the bottom, back 

 downwards, antennae pointing upwards 

 and mouth brushes kept in constant 

 motion. They feed at or near the 

 bottom. 



In colour the larva is yellowish-brown 

 when full grown. Length 7 to 8 mm. 

 Head pale yellow, no markings. An- 

 tennae large, with small stout spines, 

 thickest centrally and twice curved, 

 terminating almost in a point ; lateral 

 tuft below the middle ; mentum with 

 eight teeth on each side of apex. 

 Lateral comb of eighth segment consists 

 of 5 to 8 scales only arranged in form of 

 an arc on a separate band ; the scales have a long terminal 

 spine and two shorter ones apical, and side spines still smaller 

 and two small ones between the long apical ones. Siphon 

 very small, three times as long as broad, with two apical curved 

 spines ; the pecten with 5 to 8 spines, each with long teeth 

 (2 or 3). Anal gills long, twice as long as siphon. The larva 



Fig. 106. 



G. discolor. Coquillett. 



a, antenna ; b, labial plate 



of larva. 



