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Vol. XXXIX. LONDON, DECEMBER, 1907. No. 12. 



NEW SPECIES OF COLORADO APHIDID.L; WITH NOTES 



UPON THEIR LIFE-HABITS. 



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



In our suidy of Colorado Aphididas during the past two or three 

 years, we have endeavoured to trace each species throughout the entire 

 year. In doing this work it has been necessary to make careful descrip- 

 tions of the lice in all their stages of development. 0;i account of 

 inadequate descriptions of some of the described species, it is impossible 

 ill some cases to decide whether a louse under examination is a described 

 species or not, and in other cases there seems to be very little doubt but 

 that the species being studied is new to science. Some of the apparently 

 new species I am describing below. If in any case an old species should 

 be redescribcd, I hope I shall give the description and the life-habits full 

 enough in each case so that other workers may be able to tell upon what 

 species I was working. Even this in some cases may not be an easy 

 matter. 



Unless otherwise stated, the descriptions are made in each case from 

 fresh living specimens, and the colours given as they appear under a hand 

 lens. 



Aphis iorticatida, n. sp. 



A large red louse on native thistles, Carduus sp. Light to dark red 

 in general colour, with antennre and cornicles black. 



Apterous Viviparous Female (Plate 11, figs, i and 4). 



Described from specimens taken at Fort Collins, Colo., July 22, 1907. 



Length, 3.5 to 3.75 ram ; width, 2 to 2.20 mm.; antenna, 3 mm. 

 Joints: III .9, IV .6, V .5, VI .14, VJI .6 mm. Joint 3 with about 

 30 and joint 4 with 12 or more small circular sensoria. Joints i to 6 with 

 a few short stout hairs on each. The antennae are upon slight tubercles, 

 and there is a small blunt tubercle on either lateral margin of the prothorax 

 and each abdominal segment. The entire dorsum, including head, 

 unicolorous-red ; eyes, distal ends of femora, tibiae, and all of tarsi, 

 cornicles and antennae black or blackish. Cornicles about .75 mm. long, 



