345 



median one, and is similarly armed at apex; between the submcdian 

 and dorso-lateral warts is a longitudinal series of much smaller ones in 

 direct line with the others, and on the upper margin of lateral area is a 

 similar series of small warts, the whole forming a diagonal series on 

 each side of the 6 segments; medio-lateral line with a pair of small 

 warts on middle of each segment, the anterior one of each pair white, 

 with a conspicuous small brown spot ventrad of it, and located almost 

 vertically midway between the warts of the series dorsad of it ; on the 

 ventro-lateral line is a single wart on each segment, located in direct 

 vertical line between the pair in medio-lateral series ; ventral segments 



1 to 4 each with a small slightly raised circular area on each side of the 

 median line, each area being crowned with numerous dark brown setu- 

 lose hairs; the remaining segments somewhat flattened and slightly 

 fused, without the well-defined circular areas of the anterior 4, though 

 still discernible, and without the setulose hairs; apical 2 segments each 

 with a transverse series of 4 thornlike processes, 2 on the marginal and 



2 on the submarginal line ; apical process about 7 times as long as thick, 

 shining brown, transversely oval in cross-section. 



The pupal exuvium from which the above description was drawn, 

 is that of a male. The pupa was obtained in a wood at Urbana, 111., 

 May 12, 1888, by Mr. Hart, and the imago emerged 3 days later. 



Banks records the species from Falls Church, Va., where he ob- 

 tained the pupa on oak bark about the middle of March, the imago 

 emerging March 27. He has briefly described the puparium,* and 

 states that the larvse of Ceria are said to feed in flowing sap of trees. 

 No data on the food habits are on file in this Laboratory. 



C. zvillistoni has been given by some authors as a synonym of C. 

 signifer Loew. The puparium of siynifcr is briefly described l)y C. 

 W. Johnson. t It was found by Dr. Skinner near Bala, Pa., on an oak 

 leaf. It is not possible to decide from the description whether it is 

 identical with that here described. 



The localities from which signifer has been recorded include 

 Mexico, Florida, and Texas; ivillistoni was described from Kansas. 



EPHYDRID^ 

 Hydrelua scafularis Loew 



Hydrellia scapularis Loew, Mon. N. Amer. Dipt., Vol. 1, 1862, p. 153. 



Larva. — Not preserved, the following characters being ascertained 

 from an examination of the puparium. Anterior and posterior mar- 



•Ent. News, Vol. 4, 1893, p. 91. 



tProe. Ent. Soe. Wash., Vol. .'5, 1903, p. 310. 



