June, 1898.] DYAR \ LlFE-HlSTORIES N. Y. SLUG CATERPILLARS. 91 



(4); a yellow subdorsal line on joints 3-12, not quite reaching either 

 extremity, the pair unconnected at the ends, but centrally on joints 6-9, 

 broadened to the top of the depressed spaces (4) and enclosing in the 

 dorsal space a reddish patch on joints 7-8 with salmon-colored margin 

 and dark brown latticed ridges. In some examples a reddish mark 

 appears on joint 3 between the subdorsal lines. Length, 3.2-4.3 mm. 



Stage VI. — Structures as before, tail rounded quadrate. Depressed 

 spaces large, the latticed ridges closely clear granular. Green, the 

 large lateral depressed spaces (4) shaded with yellow. The yellow 

 subdorsal lines reach joints 3 and 13, entirely free * or joined by a 

 yellow bridge on joints 7 to 9 containing a red spot of varying form, 

 corresponding to the variety of the larva. In an example from 

 Bellport, Long Island, the spot was cordate, the depression in front, 

 pink and edged with a crimson line. In another it was in the 

 form of a cross, darker, shaded with brown on the latticed ridges and 

 encroaching on the subdorsal line. (See T. pallida, pi. VI, fig. 4.) 

 In others the shape was circular, or of the form of the "club" or 

 " spade " as usually depicted on playing cards. There is also another 

 spot at the anterior end. In the Bellport larva it was elliptical, cover- 

 ing joint 3 dorsally, bright red and edged with yellow. In another 

 from Fort Lee, N. J., it was shaded with dark brown like the central 

 spot. It was present in a larva which lacked the central spot entirely. 

 Length, 4.2-6.3 mm. 



Stage VII. — (Plate VI, figs. 5 to 9.) Shape as described. Dorsal 

 space of uniform width, scarcely narrowing anteriorly. Skin rather 

 regularly coarsely watery granular on the latticed ridges, the depressed 

 spaces narrow, finely granular. Color pale yellowish green, pigmented 

 in the dorsal and upper half of lateral space, clearer green below. All 

 the depressed spaces yellow in the bottom, the largest with glandular 

 green centers. Subdorsal line yellow, straight from joint 3 to the tail, 

 rather broad. On the anterior edge of joint 3 a red mark, widened 

 along the edge, produced backward in the dorsal space more or less. 

 The central dorsal red mark is very variable. It may be absent (Plate 

 VI, fig. 8) or represented only by a narrow yellow bridge on joint 8 

 slightly red tinted (Plate VI, fig. 9). The usual form is a rounded 

 cross, reaching on the sides nearly or quite to the lateral depressed 

 spaces (4) and in the dorsal space on joints 7 to 9 ; it may be enlarged 

 to a hexagon (Plate VI, fig. 6) or extend in a dorsal band the whole 



* Out of 263 larvae which were found in an oak woods at Yaphank, L. I., only 

 three were entirely without the yellow bridge (Plate VI, tig. 8). 



