THE CANADIAN ENTOMOLOGIST 181 



NOTES ON THYSANOPTERA FROM BRITISH COLUMBIA. 



BY R. C. TREHERNE, FIELD OFFICER, ENTOMOLOGICAL BRANCH DOMINION DE- 

 PARTMENT OF AGRICULTURE. 



The following notes are submitted herewith to augment our knowledge of 

 Western Thysanoptera, a group which appears to have been sadly neglected 

 by Canadian entomologists. 



Orothrips kelloggii yosemitii Mouiton. (Plate XV, Figs. 1-3.) 



A single female of this variety was taken on Mt. McLean at Lillooet, B.C., 

 at an altitude of about 6,000 feet, off Amelanchier, on July 25, 1917. I have 

 been unable to compare this single female with specimens of kelloggii or of its 

 variety yosemitii. From the description, however, given by Mouiton (1), the 

 the shape of the sense areas on antennal segments 3 and 4, together with the 

 relative lengths and colours of the antennal joints, clearly place the specimen 

 from Lillooet as belonging to the variety yosemitii. There are, however, certain 

 structural features in the specimen before me which differ from the short de- 

 scription given by Mouiton. 



Antenvce. — ^The measurements of the antennal segments compare with the 

 description with the exception of segment 4, which compares with segment 

 3 in length as 74 to 99At, instead of as 96 to 99^. The constriction 

 in segment 3 is not very apparent, and the base of segment 3 is white or at least 

 lighter in colour than the apical portion of segment 2, which is yellow. Sense 

 areas are present on the apical portions of segments 3, 4, 5 and 6; those on seg- 

 ments 3 and 4 ovoid; those on segments 5 and 6 circular, with a simple trans- 

 parent sense-cone protruding from each. There also appear to be two ovoid 

 sense areas, beside each other, on segment 3, and the same on segment 4. 



Mouth Cone. — Maxillary palpi 7-segmented, the basal joint large and as 

 long as the remaining six segments; labial palpi 4-segmented.(2)* 



Colour. — The colour is brown; head and prothorax darker than the re- 

 mainder of the body, which is shaded with orange. 



It may be se?n, therefore , that despite the small variations noted, the 

 species from Lillooet belongs to the variety yosemitii. Being so, it is interesting, 

 as this record greatly extends the distribution of this insect, which so far has 

 only been recorded from the Yosemite Valley, California. 



.^olothrips fasciatus Linn. (Pirate XV, fig. 4.) 

 I find in my collection two male specimens of this species; one taken off 

 Lithospermum pilosum from Kelowna, B.C., on May 16, 1917; and the other 

 off the bloom of the cultivated dahlia from Agassiz, B.C., on July 14, 1914. 

 The latter specimen was taken in association with females of the same species 

 and with many adults of Frankliniella tritici. In the literature at my disposal 

 I have been unable to find any reference to males of M. fasciatus. For that 

 reason I submit herewith the following description with the respective measure- 

 ments of the two specimens before me. 



JE, fasciatus, 2 malfes (A and B). 

 Head, length .14 mm. and .14 mm., width .17 mm. and .18 mm.; prothorax, 

 length .15 mm. and .15 mm., width a cross centre .18 mm. and .20 mm.; meso- 



*Moulton (2) gives labial palpi 4 — segmented in the key, but on pp. 45-46 gives .5 — seg- 



mented in the description of the genus and species. 

 August, 1919 



