AGKICULTUKAL EXPEEIMENT STATION. 121 



Fourth and fifth segments each bear an obscure brown spot on the lateral 

 dorsum. Part border of the narrow sixth segment dark brown but 

 usually turned under the abdomen so that from above the end of the 

 abdomen appears yellowish. There is a row of ten long bristles on 

 the posterior border of the fifth segment (see Plate I, Fig. 10.) 

 Attached to the lower surface of the sixth segment is the external 

 genital apparatus composed of claspers, guide and penis. The 

 claspers are club-shaped and notched near the posterior end on the 

 interior edge. The guide between the claspers is a horse hoof shaped 

 organ half as long as the claspers ending in a tuft of hairs and back- 

 ward narrows into a small pedicil. The penis is exceedingly long, 

 bearing at the end an enlargement to which is attached a pedicilate 

 pear-shaped appendage. See Plate I, Figs. 8 and 10. 



The wings as in the female. 



Measurements of Male Fly. — Total about 6.5 mm. Head .931 mm. 

 long, depth .1064 mm. exclusive of rostrum,breadth 1.729. Width of eye 

 from dorsal view .399 mm. Front view nearly round, about .745 mm. 

 with mouth up anterior distance between eyes .675 mm. posterior, 1.33 

 mm. Arista 2.93 mm. Thorax 2.13 mm. long. Abdomen 3.46 mm. 

 long, 1.33 mm. wide. Segments in the ratio 3:4:4:4:5:2. 



Eggs — Opalescent white, oblong, pedicelate. The pedicelate end 

 snore pointed than the other which is somewhat obtuse. The pedicel 

 with a short narrow neck and bulbous at the end. The pedicelate 

 end for about one-third of the length sculptured by raised lines ar- 

 ranged in a hexagonal pattern giving a rough pitted surface,most con- 

 spicuous near the pedicel and gradually lost in the smooth surface of 

 the opposite end, about four and a half times as long as wide. They 

 measured 1.064 mm. by .24 mm. in one specimen and 1.04 mm. by .25 

 mm. in another. (Plate I, Fig. 2.) 



Larva — Length 7 mm. (.28 in.); breadth 1.5 mm. (.06 in.) White 

 with sometimes a faint rosy tint, probably due to absorption of the 

 colored juice of the currant. Footless body composed of about thir- 

 teen segments. Widest in the middle, tapering rapidly toward the 

 head, which is small, pointed and emarginate. (Plate I, Fig. 3.) The 

 mouth circular surrounded by a zone of ridges and furrows. From 

 the mouth protrudes two curved parallel retractile black hooks, the 

 rasping organs of the larva, by means of which it gnaws the fruit. 

 (Plate I, Fig. 6.) The chitinous frame work to which these hooks 

 are attached shows as a black area in the second and third segments. 

 These hooks and frame work give the end of the head a black ap- 

 pearance. There are two pairs of tubercles upon the front of the 

 first segment. The lower pair smaller. (Plate I, Fig. 6.) The ce- 

 phalic and candal spiracles are yellow. The former between the 

 third and fourth segments and lacerate funnel formed. The latter 

 are on the posterior face of the last segment and end in three finger 

 like thorns. (Plate I, Fig. 5.) These are connected by trachea with 

 large anastomosing branches at the posterior and anterior ends. 

 The larva when first hatched is about 1 mm. long, and slender 



