242 ENTOMOLOGICAL NEWS. [Oct., 'o2 



Note on Rhagolctis Suavis Lw. with a Description of 

 the Larva and Puparium. 



By George F. Babb, Amherst, Mass. 



A large number of dipterous larvae were seen last fall in the 

 pulpy coverings of the fruit of the black walnut, Juglans nigra, 

 on the grounds of the Entomological Laboratory of the Massa- 

 chusetts Agricultural College. Many of these larvae were col- 

 lected and allowed to pupate. This spring several specimens 

 of Rhagoletis suavis Lw. and some hymenopterous parasites of 

 the species Aphareta atwipes Prov. emerged from the pupae 

 saved. I am indebted to Messrs. Coquilette and Ashmead of 

 the National Museum for determinations. 



A description of the larva and puparium of this species, not 

 having been hitherto published, is here given. 



Length lo mm. Greatest width 1.5 mm., 12-segmented, brownish yel- 

 low, gradually tapering to the anterior end, slightly to the posterior end 

 which is blunt. The first anterior segment bears the depressed mouth 

 parts which are of peculiar structure. The second segment bears on each 

 side a prominent free structure like a human ear in shape. The twelfth 

 or posterior segment bears on the dorsum of the blunt face a pair of pro- 

 jections whose crescent-shaped extremities are each marked with three 

 pairs of dark lines. Below these projections is a pair of spots and on the 

 ventral edge are two pear-shaped protuberances. The ventral half of 

 each joint is armed with very short setae directed backward and arranged 

 in short wavy lines which, under low magnification, appear like punctured 

 lines. Those on the first joint appear all around, on the dorsum as well 

 as on the venter. The puparium is ellipsoidal in shape, 5 mm. long and 

 2 mm. in greatest width. It bears all the external features of the larva 

 but in a degenerate form. 



EXPLANATION OF PLATE XIV. 



Figs. 1-3 are lateral, dorsal and ventral views respectively of the larva. 

 Figs. 4 and 5, dorsal and ventral views of puparium. 

 Fig. 6, the mouth parts magnified. 



a. Small spots on last segment. 



b. Projections on dorsal part of same. 



c. Mouth part.s. 



d. Lateral prominence on second segment. 



e. Areas with setse. 



/. Projections on ventral part of last segment. 



Letters are the same in all figures. 



Fig. 7, magnified portion of e. 



Fig. 8, magniliod projection d. 



V\%. 9, magnified projection b. 



