Dec. iS97.] Dyar: New York Slug Caterpillars. 167 



THE LIFE -HISTORIES OF THE NEW YORK SLUG 

 CATERPILLARS.— XII. 



PLATE IX, FIGS. T-IO. 



By Harrison G. Dyar, A M., Ph.D. 



A pod a bi guttata Packard. 

 \Z(i\—Lhnacodes biguttata Packard, Proc. Ent. Soc. Phil. Ill, 341. 

 \%(it^—Limacodes tetraspilaris Walker, Cat. Brit. Mus. XXXII, 486. 

 x'i-^i^—Limacodes biguttata Stretch, Zyg. & Bomb. N. A. pi. 8, fig. 16. 

 1^^2—Limacodes biguttata Grote, Check List. 

 lZ<^2—Apoda biguttata KiRBY, Cat. Lep. Het. I, p. 553. 

 1894— ^/ofl'a biguttata Neumogen & Dyar, Journ. N. Y. Ent. Soc. II, 73. 



Larva. 

 1894— Dyar, Ann. N. Y. Acad. Sci. VIII, 221 (as A. y-inversa). 



Special Structural Characters. 

 Dorsal space broad, narrowing slightly toward the extremities, 

 ending behind in the broadly quadrate joint 13, not strongly arched. 

 Lateral space broad, oblique, scarcely concave, narrowing a little to- 

 ward the extremities. Subventral space small, contracted. Ridges at 

 first prominent and tubercular, setiferous, later smooth, granular, the 

 subdorsal ridge formed only by the change in slope between back and 

 sides. Setee of Stage I single, on the thorax ia-iib and iv, on abdomen 

 i-iii converted into tapering spines with expanded trifid tips, the upper 

 two on joints 4-1 2 united into a single spine of which one seta forms a 

 knot-like prominence on the other, exactly as in A. y-inversa. These 

 setae lean in alternating directions. Later the warts are represented by 

 short sets, normal in number, not united together; in the last stage al- 

 most entirely absent. Depressed spaces fairly well developed, small, 

 but not very sharply defined, but all present (i)-(8). Skin at first 

 smooth, later with secondary spines on the tubercles and conical 

 granules, finally uniformly covered with round clear granules. After 

 the last molt the specific white coloring definitely appears, of the same 

 general character as A. y-inversa. There are six or seven stages. In 

 the former case the stage before the last as here described is omitted. 

 Affinities, Habits, etc. 

 This larva does not differ structurally from A. y-inversa with which 

 it is strictly congeneric, and the same remarks will apply to both species. 

 (See Journ. N. Y. Ent. Soc. Ill, 152.) In color it is the same whitish 



