Dec. iSgg.] DyAR: LiFE- HISTORIES OF N. Y. SlUG CATERPILLARS. 253 



n. A patch of black pigment under the cervical shield in stage I. 



Whitish green, the yellow subdorsal line edged by a dark shade. 

 O. Cochlidion bigitttata with the ancestral characters. .Food oak. 

 p. CocJiUdio)! y-iiiversa. A yellow line crosses joint 3 to join the sub- 

 ventral lines. Food hickory. 

 q. The short limb of the Y-shaped spine of stage I still more reduced 

 than in branch d. One seta of the middle thoracic wart is lest. 

 Joint 13 produced with a pointed tail in the last stage. Skin granules 

 discreet, not spinous. 

 r. Packardia gemiiiata. Whitish green, well pigmented. 

 8. Packa' dia elegaus. Skin granules more numerous ; yellowish green, 



slightly pigmented ; subdorsal line wavy. 

 t. Apoda 7-ectilinea, its probable position, the larva being unknown. 

 Explanation of Plates VII-VIII. 

 Six maps showing the probable distribution of land and water in the Present, 

 Eocene, Upper Cretaceous, Lower Cretaceous, Jurassic and Triassic peiiods respect- 

 ively. 



DESCRIPTION OF THE MATURE LARVA OF 

 ACRONYCTA CONNECTA. 



plate II, FIG. 7. 



By Harrison G. Dvar. 



The description quoted in the Proceedings U. S. National Museum, 

 XXXI, 116 is insufficient in regard to the hair structures, and has led 

 me to place the larva wrongly in the table. It should fall in larval 

 section II, next to vitmnla. 



Acronycta connecta Grt. Larva. — Head bilobed, rounded, whitish 

 in the sutures, most of the surface dull black, shining only at the 

 apices of the lobes ; setae white, rather long ; width 3 mm. Body 

 with low warts, scarcely at all elevated ; i with a black hair and sev- 

 eral very small ones, ii to iv, single haired, v and vi, many haired, 

 but diffuse and confused with the rather numerous pale secondary sub- 

 ventral hairs. • Leg plates scarcely cornified, hairy ; anal plate not 

 cornified ; cervical shield bisected, concolorous with the body except 

 for a black line that edges the inner portions of the two halves and 

 runs a little way along the anterior edge. Body greenish white, pur- 

 plish on the dorsum. A broad orange subdorsal line almost enclosing 

 wart ii, reaching from the cervical shield to anus. Warts i and ii 

 small, round, black ; spiracles black ; feet pale ; no other marks. 



Food-plant. — Willow. Collected by Mr. Aug. Busck at Wash- 

 ington, D. C, Oct. 2. 



I 



