238 MAINi: AGRICUI.TURAI, e;xPE:rIME;NT STATION. I909. 



mesonotum and scutellum rather more conspicuous. Anterior 

 2-3 of each tergum brown, posterior third yellow, venter mainly 

 yellow, seventh segment nearly wholly brown, terminal segment 

 yellowish ; abdominal set« short, black, those on posterior mar- 

 gin of first ventral segment most conspicuous ; the forceps which 

 are pale yellow consist of 2 small conical lobes. Coxse and legs 

 pale yellow, extreme tips of coxse and immediate bases of 

 femora brown, second and third coxse sometimes with a brown 

 spot near middle; tibiae and tarsi appear infuscated due to the 

 fine, black setulse which are arranged in longitudinal rows ; 

 metatarsi of middle and hind legs, sparsely ciliate with small 

 setae which are less than half as long as the diameter of the 

 metatarsus. Wings hyaline, faintly smoky, the cell R2+3 some- 

 what more dusky, veins brown; subcostal crossvein present, 

 basal in position ; coalesced part of the media about twice as 

 long as the petiole, Halteres yellow with brown knob. Ithaca, 

 New York. Specimens also from Intervale, N. H. (G. M. 

 Allen) ; Philadelphia (C. W. Johnson). 



A female specimen from Philadelphia differs in having a sug- 

 gestion of a black cloud on apex of the wing and abdomen with 

 greater extent of brown fascia. 



3. Genus Cerotelion Rondani. 

 Cerotelion, Rondani, Dipt. Ital. Prodromus, I. 191. 2. 1856. 

 This genus possesses the characters of Ceroplatus but differs 

 in having the anterior branch of the radial sector R2-I-3 ending 

 in the costa instead of in Ri (fig. 83). As far as known the 

 subcostal crossvein is absent and the claws have only i or 2 

 basal teeth. 



Table of Species. 

 a. Thorax spotless, reddish yellow, pleura yellow ; abdomen 

 reddish yellow, base of basal segments and the whole of 

 the apical segments black. Length 3.7 mm. Kansas. 



I. apicalis. 

 aa. Thorax with stripes. 



b. Fore metatarsus a little longer than its tibia. Length 



5 mm. Mexico, Pennsylvania. 2. helhdus. 

 bb. Fore metatarsus 2.5 times as long as its tibia. Length 



6 mm. St. Vincent. 3. longimanus. 



