236 MAINE AGRICULTURAL EXPERIMENT STATION. I909. 



Table of species. 

 a. Thorax and abdomen black, lateral margin of abdominal 

 segments whitish; wing with black mark; length 10 

 mm. Carolina. i. carbonarius. 



aa. Thorax more or less yellow. 



b. Abdomen nearly entirely yellow ; coalesced part of the 

 media longer than the petiole. 2. tcriuiiialis. 



bb. Abdomen with distinct brown markings. 



c. Coalesced part of the media about equal to the 

 length of the petiole; dark spot near apex of 

 wing; abdominal segments more than half 

 yellow. 3. clausus. 



cc. Coalesced part of the media about twice the 

 length of the petiole; no spot near apex of 

 wing in male, and only feebly indicated in the 

 female ; yellow of abdomen confined to apical 

 third of each segment. 4. iiiilitaris. 



I. Ceroplatus carbonarius Bosc. 

 1802-4. carbonarius Bosc, Nouv. Diet. Nat. Hist. IV. 543. 

 Length 10 mm. Head black; thorax black, smooth; abdo- 

 men elongate, cylindrical, black, the lateral margins of each 

 segment white; wing hyaline with black apex; legs dusky. 

 Carolina. 



2. Ceroplatus terminalis Coquillett. 

 1905. terminalis Coquillett. Journ. N. Y. Ent. Soc. XHI. 69. 

 Male. Length 9-10 mm. Light yellow; claws and ocellar 

 area, black; vertex, a fine median line and 2 pairs of thoracic 

 dorsal stripes of which the inner pair converge posteriorly, 

 longitudinal pleural stripes, sternum, median spot on scutellum, 

 lateral spots on first abdominal segment, knob of halteres, spot 

 on sides of middle and hind coxae and their apices, antennae and 

 forceps more or less brown. Antenna; more dusky yellow than 

 the remaining parts. Inferior tubercle of the first antennal 

 joint subconical, over half as long as the diameter of the second 

 segment. Thoracic and abdominal setae black. Wings hyaline, 

 veins yellowish brown, an oval yellowish cloud over R2-I-3 

 extending into the adjacent cells, subcostail crossvein present; 



