THE CANADIAN ENTOMOLOGIST. 17 



NEW SPECIES OF COLORADO APHIDID.^^:, WITH NOTES 



UPON THEIR LIFE-HABITS. 



BY C. P. GILLETTE, FORT COLLINS, COLORADO. 

 (Continued from Vol. XXXIX, page 396.) 



Myziis Braggii, n. sp. (Plate i, figs, i, 2, 3). 



A beautiful pale yellowish or greenish-yellow louse, with bluish-green 

 markings ; upon Canada thistle, Carduiis arvensis. 



Winged Male (Fig. 3). 



Described from specimens taken at Fort Collins, Colo., Oct. 26, 1906. 



General colour light yellow, or greenish-yellow. Head, thorax, 

 antennae, tarsi and distal ends of tibiae black or blackish. The dorsum of 

 the abdomen has black transverse bands on all of the segments, except 

 the first two. Femora black in distal two-thirds, but light near the coxae. 

 The pleuron of the mesothorax, the coxae, more or less of the cornicles, 

 about four or five spots on either lateral margin of the abdomen, the beak 

 except at base, the subanal and subgenital plates, and the nervures of the 

 wings, dusky brown to blackish in colour. Eyes dark red ; cauda pale 

 yellow ; cornicles .40 mm. long, slender, cylindrical, straight, or very 

 slightly curved, and with flange at free end. Length of body, 1.80 mm.; 

 length of wing, 3 mm.; length of antenna?, 2.30 mm. Prothorax without 

 lateral tubercles, a slight tubercle on vertex of head for ocellus. Joints of 

 antennae measure about as follows : III .51, IV .43, V .37, VI .11, and 

 VII .90 mm. The sensoria are abundant on segments three, four and 

 five. They are oval and placed with their greater diameters across the 

 antennal segments. A cluster of about six or eight sensoria are placed at 

 the end of segment six. 

 Winged Viviparous Female (Fig. i). 



Described from specimens taken at Fort Collins, Colorado, Oct. 5, '07- 



In general appearance hardly unlike the male described above, but 

 differs by being a little larger (about 2 mm. long), by having the black 

 colour upon dorsum of the abdomen in a solid rectangular patch on joints 

 3, 4 and 5, by having a transverse band on joint 6, and by lacking the 

 black tip to the abdomen, but with subgenital plate dusky. Sensoria 

 abundant on joints 3, 4 and 5 as in the male ; cornicles slender, a little 

 curved and .50 mm. long. 

 Apterous Viviparous Female (Fig. 2). 



The ground colour of this female is very pale greenish-yellow, with a 

 broad but more or less obscure dark stripe of green extending over the 

 thorax and abdomen about midway between the median and lateral lines 



January-, 1908 



