4-28 Professor Williston on the 



the third joint otherwise black. Mesonotum light-yellow, with 

 three broad, opaque black stripes coufluent in front, the median 

 stripe I'eaching but little past the middle ; in addition, a slender 

 strifula above the root of each wing. Scutellum blackish 

 on the lateral margins; with two erect bristles at the apex. Pleura; 

 light-yellow. Metanotum black, except ou its uppermost part. 

 Abdomen black, but whitish pruinose ; the fifth segment with a 

 yellowish hind margin ; venter yellow. Legs yellow ; coxse and 

 femora light-yellow, the tibial brown, the tarsi black or blackish. 

 Length 2| mm. 



Two specimens. This species, the only one that has 

 been recognized in the western continent, appears to 

 resemble the European C. acidicornis. As in that species, 

 the fourth vein terminates at the extreme tip of the wing, 

 the distance between the two cross-veins is less than half 

 of the length of the last section of the fifth vein. The 

 wings are nearly hyaline. 



Agromyza. 



Fallen, Agromyzidse, 1823. 



1. Agromyza lateralis, n. sp. (PI. XIV., fig. 156, head.) 



^ , $ . Front of equal width throughout, less than one-third 

 the width of the head, wholly light-yellow opaque, except a minute 

 black spot between the ocelli. Antennse black, the second joint 

 and the third at its base somewhat yellowish. Face and cheeks 

 yellow like the front, the latter narrow, and with a row of small 

 bristles along the oral margin, the anterior one of which forms a 

 moderately stout vibrissa. Palpi black. Occipital orbits yellow, 

 obsolete above. Occiput concave, opaque black. Thorax black ; 

 mesonotum moderately shining, the lateral margins light-yellow, 

 broader in front of the wings, and extending over their root, and 

 sometimes including the postalar callosities. The mesonotum has 

 short black hair, and the median rows of bristles extend as far 

 forwards as the middle. Abdomen black, a little shining, clothed 

 with black hair. Halteres light-yellow. Legs black or brownish- 

 black, the tarsi brown or brownish-yellow. Wings hyaline ; 

 penultimate section of the fourth vein not longer than the posterior 

 cross-vein ; first and second basal eells united. Length 2-3 mm. 



Numerous specimens. 



