38 

 NOTES ON ADELOCEPHALA BICOLOR, HARRIS. 



By H. S. Jevvett, M. D., Dayton, O. 



In the following description, the dorsal line is the line run- 

 ning along the centre of the back. The stigmata I line is the line 

 passing through the spiracles. The snh-dorsal //;/^' is the line mid 

 way between the dorsal and stigmatal lines. The dorsiun is the 

 space extending on each side of the dorsal line to the sub-dorsal 

 lines. The sub-dorsal space is the space between the sub-dorsal and 

 stigmatal lines. The stigmatal space is the space between the base 

 of the legs and stigmatal line. The venter is the under surface of 

 the larva. 



The eggs are smooth, pale-green, oval disks one-twentieth 

 inch in longer, one-twenty-fourth inch in shorter, diameter and one- 

 thirt}^-second inch thick. As they approach maturity they be- 

 come biconcave and change to yellowish-brown in color. From 

 thirty-six to forty-eight hours before hatching, a dark brown spot 

 (the head of the larva which lies coiled around the edge of the 

 disk-shaped eggs) becomes visible through the translucent shell. 



Eggs deposited May 26 hatched on May 31. Larvae one- 

 eighth inch long, pale green. Head very dark glossy brown 

 (nearly black); sub-quadrate, bilobed, with a number of minute 

 stiff black hairs scattered over it. Each segment, from the first 

 to eleventh, inclusive, has three (3) conical tubercles on each side 

 of the dorsal line ; one on the sub-dorsal line, another just below 

 it, and the third just below the stigmatal line. Each of these 

 tubercles gives rise to a short black hair. The second and third 

 segments, in addition to these tubercles, have (on each side of 

 the dorsal line) two long (one-eighth inch), filiform, many- 

 branched protuberances, eachtermmating in a minute pear-shaped 

 knob from which project two short spines. When the larva has 

 just emerged from the Qgg, these protuberances are brown in the 

 half next to the larva and red in the terminal half; but in a few 

 hours the color changes so that the half next to the larva, the 

 knob and the branches are dark brown, and the remaining por- 

 tion is red brown. In the fourth to eleventh segments, inclusive, 

 the dorsal line is marked by a fine black line, and the sub-dorsal 

 space is occupied by a colored band consisting of five delicate 

 lines; first a white line just below the sub-dorsal line, next a 

 black line, then a gray line, then a white line and then a black 

 line. The eleventh segment is quite prominent, bearing upon the 

 dorsal line a large, many-branched, dark red-brown protuberance. 

 The twelfth segment has two dorsal and six lateral green tuber- 

 cles, each giving rise to a short black hair. Legs green, tipped 

 with brown ; prolegs green. 



Larvae passed their first moult June 4, devouring their cast- 

 off skins ; one-quarter inch long, bright green. Head sub-quadrate, 

 bilobed, brown with a narrow green line on each side, running 



