48 



The accredited distribution of Agrilus anxius as redescribed by Horn 

 (Trans. Ainer. Ent. Soc, Vol. XVIII, p. 306) is "Massachusetts and 

 INew Hampshire; westward to Colorado." 



In the collection of the National Museum and that of Messrs. Hub- 

 bard and Schwarz and of the writer the following localities for this 

 species are taken, with addition of some that have already been 

 recorded : Mount Washington, N. H. ; Boston aucl Plainfield ( ?), Mass. ; 

 Buffalo, Ithaca, "Adirondacks," Elk Lake, and elsewhere in New 

 York; Allegheny, Pa. (Hamilton); Lake Superior, Marquette, Detroit, 

 Agricultural College, and Port Huron, Mich.; Stone Creek, Va. ; Prov- 

 ince of Quebec, near Ottawa (Harrington). 



The larva. — The larva (fig. 17, c) resembles that of other species of 

 its genus, being elongate, flattened, the first 

 thoracic segment — which is apt to be mis- 

 taken for the head, the latter being retrac- 

 tile within it — rather prominent, and the 

 anal segment terminating in a pair of slen- 

 der corneous forceps-like processes. The 

 color is creamy white, the mouth parts dark 

 brown, nearly black, the remaining portion 

 of the head, the first thoracic, and the anal 

 segments being darker yellow. Being foot- 

 less, the dorsal and ventral surfaces do not 

 differ so noticeably as in many larvae. 



In the absence of a large series of the larvae 

 of other species of Agrilus, a specific descrip- 

 tion need not be attempted at the present 

 time, particularly since all of the examples 

 of this species which we have are freshly 

 killed, and the material in other species is 

 alcoholic and has, for the most part, been 

 preserved for several years. 



The larvae at hand appear to be unusually 

 stout, but it is possible that this. may be 

 accounted for by the fact that they had gone into hibernation and are 

 unable to recover from their torpor. They are between five and six 

 times as long as wide at the widest abdominal segment. 



The first thoracic is of about equal width with the widest abdominal 

 segments ; the second and third thoracic are a little narrower; all of the 

 abdominal segments are subequal except the last two, the penultimate 

 being about the same width as the second and third thoracic. The anal 

 segment does not appear to differ from that of other species, the fork 

 being of the same shape and bidentate on the inner surface. 



The length is a little less than three-fourths of an inch (17-18 mm.) 

 and the width is a trifle less than an eighth inch (2-7 mm.). 



Fig. 17. — Agrilus anxius: a, 

 female beetle; b, first abdominal 

 segments of male from below; 

 c, larva from above — all enlarged 

 about 3£ times (original). 



