36 Journal New York Entomological Society. t^oi. xx. 



9. Wheeler, W. M. (1910). Ants, their Structure, Development, and Behav- 

 ior, pp. 357-360, 2 figs. 



Explanation of Plates II and III. 



Fig. I. Larva of Lycccna piasus, dorsal view, showing position of ex- 

 ternal organs. (X 15.) 



Fig. 2. Posterior part of same, lateral view, showing appearance of 

 organs when protruded. 



Fig. 3. Section through retracted evaginable organ ; from vertical longi- 

 tudinal sections of larva. (Camera lucida drawing, X 320.) 



Fig. 4. A single seta of the evaginable organ, and its cell. 



Fig. 5. Distal attachment of retractor muscle of evaginable organ to the 

 body wall. 



Fig. 6. Cross section of dorsal portion of larva through two of the 

 glands; external opening not shown. (Camera lucida drawing, X 80.) 



Fig. 7. Central portion of same, more enlarged. (X220.) 



Fig. 8. Section through opening of loth segment, and sac, the latter 

 everted ; from vertical longitudinal sections of larva. (Camera lucida draw- 

 ing, X 120.) 



Fig. 9. Dorsal view of glands, the skin being removed except around the 

 opening; from dissection. (Camera lucida drawing, X 90.) 



Fig. 10. Ventral view of glands; from dissection. (Camera lucida 

 drawing, X 90.) 



b.m, basement membrane ; cut, cuticula ; d.v, dorsal vessel ; eJ, evaginable 

 organs ; f.b, fat body ; gl, gland ; /;, hairs about opening of sac ; hyp, hypoder- 

 mis ; int, intima ; /, lumen of sac ; I.m, longitudinal muscles ; o, opening of sac ; 

 p, sac protruded ; r.m, retractor muscle ; ,? , setse ; spir, spiracles ; t.h, tactile 

 hairs. 



VENATIONAL VARIATION IN CLADURA 

 (TIPULID^ DIPTERA).^ 



By C. p. Alexander and M. D. Leonard, 

 Ithaca, N. Y. 



(With Plate IV.) 



There have been three species referred to the genus Cladiira Osten 

 Sacken : C. flavofcrriiginca O. S. (1859). C. indivisa O. S. (1861), 

 and a species which Loew called fuscnla (1873)." Osten Sacken 

 asserts,^ however, that the latter is not a Cladiira but possibly a 



^ Contribution from the Entomological Laboratory of Cornell University. 

 " Loew, H., Beschreibung Europiiischer Dipteren, v. 3, pp. 64—67, 

 ^ Ostenr Sacken, C. R., Studies on Tipulidc-e, Berl. Ent. Zeitsch., Bd. 30, 

 1886, Heft 2, pp. 205, 206. 



