434 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



The moth. — Fore-wings white-gray near the anal angle between veins 1 and 2, a 

 large and conspicuous spot like a Greek letter ^si, placed sidewise, and from this spot 

 a somewhat zigzag line runs parallel with the posterior border, forming a large dart- 

 like spot between veins 5 and 6. (Riley.) 



12. Sinerinthus modest us Harris. 

 Larva on Cottonwood in Illinois. (C. E. Worthiugton, Can. Eut., x, p. 16.) 

 13. Cerura horealia Boisd. 



Whether this is the G. borealis or not, it is the one mentioned by 

 Abbot and Smith as occurring on this tree as well as the wild cherry 

 and willow. According to them, on the 10th of August, in Georgia, 

 " it iuclosed itself in a case made of chips of the wood, and affixed to a 

 branch. The moth came out April 24. It liliewise feeds on the wild 

 cherry and willow, and is found also in Virginia, but it is a very rare 

 species." 



14. Ichthyura inclnsa Hiibn. 



According to Abbot and Smith this species occurs on this tree as well 

 as the willow, iu Georgia. " The caterpillars all live in a web, among 

 the leaves spun together. One inclosed itself entirely May 25 and 

 came out June 8. Another, which spun itself up October 25, did not 

 appear till the 8th of March following. The moth is rare in its perfect 

 state, though found in Virginia as well as in Georgia." 



15. Pemphigus populi-transversua Riley. 



Forming a gall upon the petiole near the base of the leaf of Populus monilifera and 

 P. bahamifera. Missouri, southern Texas, and Colorado. (Riley.) 



16. Pemphigus populi-monilis Riley. 



On the narrow-leaved cottonwood in Colorado forming a series of more or less con- 

 fluent moniliform swellings on the upper side of the leaf. 



17. Pemphigus populi-ramulorum Riley. 



Forming an irregular globular gall, often somewhat flattened, on the twigs of 

 Populus balsamifera in Colorado. (Riley.) 



18. Pemphigus paeudohyrsa Walsh. 

 Occurs on Populus angulata. (Thomas, viii, p. 151.) 



19. Pemphigus vagahundus Walsh. 



Produces a large irregular gall on the tips of the twigs of certain cottonwoods. 

 (Thomas, viii, p 151.) 



20. Pemphigus popuUcauUs Fitch. (Le Baron.) 



Also occurs on the aspen {Populus tremuloides) in Wisconsin. (Thomas, viii, p. 149.) 



21. Chaitophorus populicola Thomas. 



Found in July at Carbondale, 111., and early in September on the under side of 

 young sprouts of Populus angulata (cottonwood). 



