112 THE CANADIAN ENTOMOLOGIST. 



Here in Ohio, in every case where the writer has observed it, the 

 adults only have been found, wintering in burrows or chambers in the 

 bark clearly excavated by themselves after becoming fully developed and 

 not during larval stage. 



On February 10, I took from a peach tree in Eastern Arkansas, 

 adults, pupse and what I presumed to be larvae of this species, from all 

 sides of the tree, which, by the way, was rather a young one with bark 

 comparatively little roughened. This tree stood just above high water 

 mark, on the eastern foot of Crawley's Ridge, which marks the western 

 boundary of the swamp or overflowed country to the west of the Missis- 

 sippi River. There was here, certainly, no partiality shown for any 

 particular side of the tree. Are the beetles in Northern Ohio and 

 Western New York driven to the discrimination previously noted by the 

 lake winds, at the time they burrow into the bark in the fall, and has such 

 selection in point of attack been observed elsewhere, except near and 

 to the south of the Great Lakes ? 



CORRESPONDENCE. 



TRYPETA, CLISIOCAMPA AND AMMALO. 



The January and February numbers of the Canadian Entomologist 

 just to hand suggest a few remarks. Prof. Townsend gives a most inter- 

 esting account of the Bigelovia Trypetid, and although I had described 

 the imago as well as the gall in Ent. Mo. Mag. (Dec, 1890, p. 324), most 

 of what he writes is new. The eyes, as Prof. Townsend surmises, are 

 green in life. The variety from Johnson's Basin seems to have the char- 

 acter of my var. disrupta. The hymenopterous parasite mentioned on 

 page 52 may perhaps be a Torymus, identical with one I bred at West 

 Cliff. I also bred from the galls a new Eurytoma (E. bigelovice, Ashm.) 

 and a weevil, Anthoiiomas canus, besides the Cecid, which I described as 

 Cecidomyia bigelovice. At West Cliff, Colo., a Clisiocampa is very com- 

 mon, which, according to Mr. Dyar, must be referred to C fragilis, 

 Stretch. I had always called it califomica, following Dr. Packard's 

 opinion. An account of this insect will be found in the 4th Rept. of the 

 Colo. Biol. Assoc, where the distinctness of certain of the larvae from 

 califomica is alluded to. Populus and Salix may be added to the list of 

 food-plants. I also found larvae on Ribes aureum. I found the eggs on 

 willow branches in batches ; colour pale greyish, shape elongate, egg- 

 shells iridescent within. Ammophila robusta is an enemy of the larva, 

 but I did not notice any parasites. On page 27 Mr. Dyar refers to 

 Ammalo helops. This gets nearer to the U. S. than Surinam, at all events, 

 since Moschler in 1886 recorded it from Jamaica. With reference to the 

 foot note on page 52, it is only fair to state that the trypetid nature of the 

 Bigelovia galls was first discovered at the Department of Agriculture, 

 Washington. This was before I had bred the imago. 



Feb. 19, 1893. T. D. A. Cockerell. 



Mailed April nth. 



