neio 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. 



Hah. 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, unlcolorella, Chamb. ; but that is 

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

 corni's, Walsm., is named from the similarly annulate 

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

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



VII. — The Gecidomyiid 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 tlie 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. — ^ . Length about '6\ millim. Face extremely 

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

 dark brown, 2 + 12-jointed j 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 ; scute Hum 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 abdomen about the 

 length of the last abdominal segment. Abdomen gxty^ last 

 segment scarlet. 



Hah. 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 



