548 



NEW YORK STATE MUSEUM 



Stump in the edge of the water near the outlet of Little Clear pond. The 

 pupal cell was located in red -rotten wood, fracturing, but not crumbling, 

 and was about a foot above the level of the water. Soon after trans- 

 formation the photograph reproduced in pi. 26, fig. i was taken. It 

 shows beside the imago, a piece of the stump, the broken cell, and the 

 pupal skin. 



This is the largest of the ashen gray species of Chauliodes. It meas- 

 ures in length to tip of wings 54 mm. Expanse of wings 95 mm. It has 

 sometimes been confused with the other common gray species Ch. 

 rastricornis, but may readily be distinguished by the characters 

 tabulated below. 



CHARACTEBS COMPARED 



BASTBICOBNIS 



PECTINICORNIS 



antennae of female 



serrate 



pectinate 



embossed markings on 

 head and protborax 



black on a paler ground 



yellow on a black ground 



prothorax 



longer than wide 



not longer than wide 



radial sector 



5-6 branched 



7 branched 



pale fuscous spots on fore 

 wings 



indistinct, isolated 



meeting in narrow, trans- 

 verse bands across the 

 middle of the wing 



base of the upper limb of 

 first fork of radical sec- 

 tor, as far as the first 

 cross vein in cell Ri 



black 



mostly white 



Near the place where the insect was found in a stump the larvae 

 referred to this species by supposition were taken: one on July 18, 

 apparently fully grown, and two smaller ones June 30. 



The full grown larva measured 55 mm in length; width of prothorax 

 5 mm; length of respiratory tubes on eighth abdominal segment only .7 

 mm. (Ch. serricornis larvae, length ^6; of respiratory tubes 5; 

 width of prothorax 3). 



Color yellowish brown, darker on head and prothorax ; margins of 

 sclerites yellowish; clypeus yellow; labrum reddish brown. Legs yel- 

 lowish, washed with brown exteriorly. A longitudinal mark of brown at 



