new North- American Insects. 329 



Case 6 millim. long, about 1 broad, cylindrical, cream- 

 colour, roughened much like a silkworm cocoon ; some 

 grains of sand attached behind the mouth ; hind end briefly 

 tricarinate. 



Hob. Mesilla Park, New Mexico, abundant on Portulaca 

 on the campus of the Agricultural College ; moths emerging 

 Aug. 5 to 7, 1898. 



Allied apparently to G. unicolorella, Chamb. ; but that is 

 smaller and does not have annulate antennae. C. pulchri- 

 comis, Walsm., is named from the similarly annulate 

 antennas, but it has a whitish costal streak, and while the 

 moth is no larger, the case is more than twice as long. 



VII. — The Cecidomyiid of the Mesquite. 



Asphondylia prosopidis, sp. n. 



Gall. — Consists of the aborted fruits of Prosopis juliflora, 

 var. glandulosa. They hang on the stalk something like 

 grapes, and are subglobose, with a pointed apical projection, 

 which represents the end of the pod. Globose portion about 

 8 millim. long and 7 broad, pointed portion about as long or 

 shorter. Colour green, becoming yellowish and tinged with 

 red. 



Papa-shell red-brown. Imago emerged Aug. 13, 1898. 



Imago. — J. Length about 3^ millim. Face extremely 

 narrow, hardly broader than the femur ; eyes black ; antennas 

 dark brown, 2 + 12-jointed; joints cylindrical, very shortly 

 petiolate, with numerous very short hairs not longer than the 

 width of a joint, not arranged in regular whorls ; first joint 

 more than twice as long as second, these two together not so 

 long as third. Last joint of palpi long. Occiput with a 

 collar of large bristles. Thorax above leaden grey, nearly 

 naked ; scutellum rounded, prominent, bristly ; prothorax at 

 sides and a part beneath wing light scarlet ; halteres with a 

 large white knob, stem and base of knob brown ; legs pale 

 greyish brown. Wings hairy, dull hyaline, iridescent, ner- 

 vures and costa blackish ; second vein terminating just at 

 tip of wing, third weak, its upper branch almost obliterated ; 

 a fold between second and third veins ; cross-vein absent. 

 The wings extend beyond the tip of the abilomm about the 

 length of the last abdominal segment. Abdomen grey, last 

 segment scarlet. 



Bab. Mesilla Park, New Mexico. 



Some years ago I found some of the galls at Las Cruces, 

 but was not then able to rear the flies. A. prosopidis differs 



