250 THE CANADIAN ENTOMOLOGIST 



Prothorax about one-fourth wider than long, base equal to apex in width, 

 sides feebly arcuate, margins slightly sinuous, hind angles with an evident but 

 not sharply-defined arcuate carina, disk convex with a shallow basal depression 

 in front of scutellum, and two vague foveae in front of middle on each side, surface 

 confusedly strigate, intervals punctate. Scutellum smooth, shining aeneous, 

 not carinate. 



Elytra very little wider than the thorax, slightly sinuate behind the humeri, 

 a little wider at middle than at base, apices rounded serrulate, not acute; disk 

 sub-convex with vague costae, suture elevated behind the middle, basal de- 

 pressions moderate, surface imbricate-granulate. 



Body beneath more shining and more bronzed than above, pubescent; 

 prosternal lobe emarginate, intercoxal process moderately broad, slightly con- 

 cave, tip acute, surface coarsely punctate becoming asperate toward the tip, a 

 smooth space at middle of lobe, propleurse less coarsely punctured ; metasternum 

 with a central smooth, narrow groove, surface coarsely asperate at middle, 

 becoming densely irregularly strigate at sides, on the coxal plates and meta- 

 episterna; first abdominal segment more finely strigate becoming more sparse 

 at middle, rest of ventral segments sparsely punctulate, denser at sides; first 

 ventral segment with a broad, shallow groove sparsely strigate above, smooth 

 with a few asperities near second segment, on which it becomes smooth and 

 vanishes near the posterior edge, last segment eroded truncate, vertical portion 

 truncate and smooth; pygidium sparsely coarsely punctate with a projecting 

 carina. Front and middle tibise feebly mucronate, hind tibiae simple; claws 

 deeply cleft on all the feet alike. Length 7.5 mm., width 2 mm. 



The type is a male from Aweme, Manitoba, collected by Mr. Norman 

 Criddle, to whom the species is dedicated. A male paratype from the same 

 locality and date (June 25, 1903) is very similar except that the front is decidedly 

 concave. There are at hand a male and a female from Toronto, Ontario, and 

 a male from Rigaud, Quebec, all of which seem to belong to this species, but 

 as there is but one tarsal claw, and that a middle one, among them, they will 

 be merely noted. Dr. Horn mentions a single specimen of this species, without 

 locality, under his remarks about anxius (Species of Agrilus of Boreal America. 

 Trans. Am. Ent. Soc, Vol. XVIII). 



The most evident character that separates this from anxius is the cleft 

 claws of the hind tarsi, but there are many, more obscure, diliferences that 

 appear to be constant when the insects are carefully studied. The head is 

 broader between the eyes, front more concave, and more coarsely punctured, 

 inner margin of eyes straighter, emargination of clypeus more shallow and 

 abrupt, prothoracic margin less sinuate, sides less arcuate, base wider nearly 

 equaling the elytra, emargination of the prosternal lobe less deep, beneath 

 more coarsely and densely sculptured in general, cleft of claws more wide and 

 deep. 



Agrilus auricomus Frost. This species has so far turned out to be extremely 

 local and occurs only for a very limited period, possibly less than a week. Speci- 

 mens of both sexes were taken on a single red oak tree, June 14, 1913, in the 

 same locality where the types were taken in 1909. On June 9, 1915, they were 

 found on a red oak tree 200 feet north of 1913 locality. It has been found only 

 on one tree in the same year, although careful search for it has been made on 



