46 



Hammond as injurious at Fishkill in 1890, Lad again made its appear- 

 ance in the summer of 1898, this being the first time it had been noticed 

 since the appearance above recorded. 



In the autumn of 1896 Mr. Dorsett collected a number of infested 

 branches of roses from the same rose house as that in which Mr. 

 Cordley had found this insect, and placed them in a jar of water under 

 a bellglass for the purpose of breeding the adult flies, 12 of which were 

 found beneath the bellglass N ovember 1 of the same year. These were 

 placed in alcohol and recently presented to this Division. A compari- 

 son of these specimens with those reared by Mr. Cordley reveals the 

 fact that two different species, even belonging to different genera, are 

 concerned in this destructive work. Tbe single male and female speci- 

 mens bred by Mr. Cordley belong to the genus Diplosis, and judging 

 from the description and figure of Kiibsaamen, are closely related to his 

 Di+rfosis rosiperda which in Germany has similar habits ( Verhandlungen 

 der Kais.-Kon. zool.-botan. Gesell. Wien, 1892, p. 54, PI. II, figs. 7 and 8). 

 The larvae of the two species, however, are very distinct ; ours entirely 

 lacks the so-called " breastbone"; the posterior end of the body is 

 rounded and bears several short tubercles, but there is no trace of a 

 pair of very long ones at the extreme apex of the body, nor of a pair 

 of very long bristles anterior to them; moreover, the surface of the 

 body in our larva is comparatively smooth, even under a very high 

 power, not showing a vestige of the minute tubercles wherewith the 

 body of the allied species is densely covered. In order that our species 

 may be recognized in the future, a description of it is given herewith: 



Diplosis rosivora new species. 



Female. — Antennae three-fourths as long as the head and body taken 

 together, subcylindrical, fifteen jointed (2+13), first two joints slightly 

 broader than the others, the first slightly longer than wide, the second 

 as wide- as long, the third about six times as long as its greatest width, 

 noticeably longer than any of the others, tapering at the base, the apex 

 suddenly narrowed into a petiole one-fifth as long as the remainder of 

 the joint; other joints suddenly narrowed at the apex into a petiole, the 

 thickened portion expanding slightly at its apex, bearing near its base 

 a whorl of bristly hairs, its apical half sparsely covered with similar 

 hairs; some of tbe hairs in the basal whorl are slightly longer than the 

 entire joint from which they spring; last joint almost one-half as long 

 as the thickened portion of the preceding joint. Wings hyaline, rather 

 densely covered with hairs, first vein reaching the costa slightly before 

 the middle of the latter; third vein terminates slightly below the 

 extreme wing-tip, the basal portion connecting it with the first vein 

 quite indistinct; fifth vein branching slightly beyond the middle of the 

 wing, the upper branch very indistinct toward its apex. Colors (in 

 balsam), head black, antennae brown, palpi yellow, thorax dark brown, 

 two subdorsal vitta?, the metathorax and front part of the breast yel- 

 low, scutellum and abdomen orange yellow, halteres yellow, an orange 

 yellow spot on each knob, legs yellow. Length 1.75 mm . 



