186" THE CANADIAN ENTOMOLOGIST 



characters of the species, and the results of this study are recorded herewith, 

 supplementing the description already given by Moulton (2). 



Head. — Width across the occiput .15 mm., across the eyes .13 mm.; length 

 3. mm.; slightly wider than long; cheeks irched; occupit transversely striate, 

 bearing eight minute spines immediately posterior to the compound eyes; a 

 pair of very prominent spines between the posterior ocelli, situated within 

 the margins of the pigmented ocell,ar crescents; a single minute spine, on each 

 side, near the margin of the compound eyes, in a lateral direction from the 

 anterior ocellus; vertex smooth; compound eyes, prominent, oval in outline 

 black with light borders, coarsely faceted and slightly pilose; ocelli approximate 

 yellow, margined inwardly with orange-brown crescents, posterior ones approxi- 

 mate to but not contiguous with the light inner borders of the eyes. Mouth- 

 cone pointed, tipped with black, maxilljary palpi three-segmented, each seg- 

 ment about equal in length, the second shortest and the third longest; labial 

 palpi two-segmented, basal segment very short. Antennae eight-segmented, 

 about two and one-half times the length of head (.32 mm.) ; spines on all seg- 

 ments pale; a forked sense area on dorsaj surface of segment 3, with a similar 

 area on ventral surface of segment 4, with a pair of moderately stout spines 

 immediately beneath each area; whorlp of minute inconspicuous hairs on posterior 

 portions of segments 3 to 6. Antennal lengths, segment 1, 33/i to 36/i; 2, 42^ to 

 47m; 3, 63/1 to 64m; 4, 54m to 64m; 5, 33m to 42m; 6, 57m to 66m; 7, 9m to 10m; 8,. 

 12m to 13m. Total length .30 mm. to .34 mm. 



The head characters, thus given, are apparently stable, and represent the 

 typical formation. Three prominent spines of equal and normal length may, 

 however, at times, be found between the posterior ocelli. Variations in the 

 antennae are frequently met with, but these may be classed as distinct de- 

 formities. They often take the form of a reduction in the number of segments 

 from eight to seven or six, either by the fusion of two segments or by the complete 

 elimination of certain segments. 



Frothorax, length .13 mm.; breadth .2 to .25 mm.; as Ipng as head, but 

 wider; dorsal surface smooth; sides slightly arched; a weak spine anteriorly- 

 directed on the anterior angles; a pair of l^arge, strong spines on the posterior 

 angles; from twenty-eight to thirty -six spines scattered over the dorsal surface, 

 all small and inconspicuous, except a central moderately stout pair on the 

 posterior margin and a single one, of equal strength, on each side, situated im- 

 mediately cephalad of the stout pair in the posterior angles. Mesothorax, sides 

 evenly convex, angles rounded; scutum (mesonotal plate) striate. Metathorax, 

 scutum and scutellum (metanotal plptes) faintljy striate; four spines along 

 anterior margin of scutum, the inner two the Ijargest. Legs moderately Ipng; 

 spines on tip of fore and middle tibiae weak; hind tibiae furnished with a row of 

 seven to nine strong, light-brown spines and a pair of stout spines borne at the 

 tip of each tibia; tarsus furnished with one comparatively stout l|ight-brown 

 spine near the base, and a few palie ones. Wings present, extending st^ghtly 

 beyond the tip of abdomen, about twelve times as long (1 mm.) as wide; pointed 

 at tips; colour very slightly tinted light-brown; costal vein thickly set with 

 from twenty-three to thirty-three long spines; costal fringe twice as long as 

 costal spines; fore-vein with twelve to twenty-two spines arranged in groups. 

 On the basal half of wing, on the fore-vein, a single small spine, foljpwed by a 



