THE CANADIAN ENTOMOLOGIST. 155 



THREE NEW CECIDOMYIID FLIES. 



BY T. D. A. COCKERELI,, COLORADO SPRINGS, COLO. 



Near Monument Creek, Colorado Springs, my wife and I recently 

 came across an undetermined species of Artemisia, about three feet high, 

 bearing many Cecidomyiid galls. The flies emerged from these galls on 

 April 2, and, as the species is new, it is herewith described : 



Diplosis Coioradella, n. sp. — $. Length hardly 2 mm. Head 



black ; thorax black, reddish posteriorly, mesothorax with rows of black 



bristles ; legs reddish-brown, suffused with dusky ; abdomen narrow, 

 reddish passing into yellowish, with long lateral hair?, genitalia darker, 

 terminal joint of forceps stout ; wings with a very long fringe ; first vein 

 reaching costa about or very slightly below middle of wing ; third vein 

 reaching the margin at the apex of the wing, but the apex is subtruncate, 

 rather bulging below, so that the most distal point seems a little below 

 the end of the vein ; fifth vein forked beyond its middle, but its distal 

 half reduced to mere shadowy lines; antennje reddish, 15 (2 + 13) jointed, 

 joints cylindrical, slightly constricted in the middle, pedicillate with very 

 long hairs, terminal joint subacuminate. The antennal joints are like 

 those figured by Coquillett of D. vioHcola. 



5 . — Head black ; thorax and abdomen dull crimson, dorsum of 

 thorax usually blackish or black, sides and apex of abdomen more or less 

 variegated with pale yellowish ; ovipositor when exserted scarcely two- 

 thirds length of abdomen ; antennae 15 (2 + 13) jointed, in one example 

 2 + 12 only, joints nearly sessile. 



Pupa-shell white, fuscous anteriorly. Larva bright orange. 



Gall a deformed flower-head, about 10 mm. long, and 5 to 6 broad, 

 covered by the greatly enlarged involucral bracts, which are smooth and 

 vary from reddish to yellowish outwardly, but on the inner side are clothed 

 with white hair. The flies emerge from between these bracts. 



The Artemisia mealy-bug, Erium lichtensioides (Ckll.), proves to be 

 extremely abundant at Colorado Springs. 



Rhabdophaga Porter ce, n. sp. — Gall. — A slight irregular smooth 

 swelling of a very small red willow-twig. The gall may be only about 

 2 mm. long, with a single cell, or 6 or 7 mm , with half a dozen or more 

 larvse ; it is in all cases inconspicuous, like a small gouty swelling of the 

 twig. 



