138 ENTOMOLOGICAL NEWS.- [May, '03 



margin. A short distance from the caudolateral margin of the last seg- 

 ment, on each side, is a very minute spine corresponding in position to 

 those of the ventral side of the other abdominal segments. 



Before pupating the full grown larva rests quietly on a leaf 

 or other object for three or four days, the body appearing to 

 become more rounded in the middle and to pull away from the 

 larval skin at the posterior margin. The skin finally splits 

 near the head-, gradually slips back and remains surrounding 

 the posterior end of the pupa which by this time has become 

 firmly attached to the object upon which the insect has been 

 resting. 



Pupa (Figs. 7-8). Length 1.5 mm. Width .82 mm. Form, oval, the 

 head end being the more broadly rounded. Color, glistening greenish 

 white ; the sides of the abdominal segments are shaded with dark, appa- 

 rently not due to surface coloring. Body above and on the sides covered 

 with knobbed spines (Fig. 7) of nearly equal size. The metathorax 

 above shows a median groove from front to rear. The ventral surface is 

 smooth and glistening white, naked except for a few slender spines on 

 the sides of the thorax and a few on the abdomen. The legs, antennas 

 and mouth parts appear as indistinct swellings. 



The following is the original description of the adult by L,e 

 Conte : 



Corylophns marginicollis. Rotundatus, niger nitidus, thorace basj 

 obtuso producto, lateribus et apice testaceo marginato, elytris punctulatis, 

 pedibus. Long .03. 



Middle and Southern States, on leaves. 



Body rounded, convex shining black. Thorax semicircular, 

 margin testaceous, base obtusely angulated in the middle, pos- 

 terior angles obtuse, elytra strongly punctulate, a little rounded 

 at the apex. Legs yellow testaceous. 



EXPLANATION OF PLATE VI. 



Figures r, 2 and 8 outlined with Abbe Camera Lucida. 



Fig. i. Dorsum of full grown larva, X 33 diam. 



Fig. 2. Venter of full grown larva (somewhat larger specimen i, X 33 

 diam. 



Fig. 3. Portion of dorsal surface of full grown larva, x 500 diam. 



Fig. 4. Left antenna of full grown larva, from below, x 150 diam. 



Fig. 5. Tarsus of full grown larva, X 175 diam. 



Fig. 6. Marginal spines from anal segment of. full grown larva, X 316 

 diam. 



Fig. 7. Spine from dorsum of pupa, X 300 diam. 



Fig. 8. Dorsum of pupa, showing moulted larval skin at caudal (upper) 



end, x 33 diam. 



