1907.] NATURAL SCIENCES OF Pill I.ADELPIll A. 15 



uj^on joints 3 to 5 quite stroufjly ciirvod, especially on joints 4 and 5, 

 tiie convexity being towards the distal ends of the joints. Joints 1 and 

 2 short, stout, cylindrical; joint 3 a little longer than 4, and joint 5 

 a little longer than 3 ; joints 3 to 5 each with a very large sensoriuni ; on 

 joint 3 it extends fully one-third the length of the joint along the ventral 

 side, in joints 4 and 5 the sensoria extend fully one-half the length of 

 the joints; there are almost no hairs except for a cluster of four or five 

 at the tip of the last segment. The antennal characters alone easily 

 separate this species from all others mentioned in this paper. The legs 

 are as distinctive as the antennae, being much stouter than those of any 

 other species I have studied (PI. XI, fig. B). 



The wax glands that are so conspicuous in cleared specimens of other 

 species of Chermcs are absent or faintly distinguished in the winged 

 females of this species. The galls of this species are very distinct from 

 those of any other Chermes known to me. 



Eggs, young, antl wingless females of this species have not been 

 studied. 



Chermes similis n. sp. (Plate VII. figs. D, D', E, E'.) 



On the visit to Victor, Colorado, August 5, I collected from trees 

 bearing galls of Chermes cooleyi another gall very similar in appear- 

 ance. Winged lice were issuing from them, as they were also from 

 galls of cooleyi. 



Galls. — The galls I collected were rather short and thick for those of 

 cooleyi; they were in every case terminal upon the twigs, and they are 

 produced by the broadening and thickening of the basal portion of the 

 needles, but not at the extreme base as in cooleyi, see PI. VII, figs. D and 

 E. At the point of attachment the needle is about normal in size, but 

 an abrupt thickening and broadening takes place about three or four 

 millimeters from the twig. Each needle is separate from its neighbors, 

 however, and may be removed without the tearing of any tissue except 

 a small spot about one millimeter across at the point of attachment, 

 so that in place of a number of separate chambers, as in the galls of 

 cooleyi, the lice live in open spaces which pass into one another about 

 the bases of the needles. The casual observer would not be likely to 

 notice any difference between this gall and that of Chermes cooleyi. 



The pupse, as in cooleyi, are quite heavily covered with white powder 

 when ready to emerge. 



Apterous females and their egg-clusters were also found in some of the 

 galls, but there was no way to make certain that they were of the 

 same species. 



The looseness of structure in the galls allowed the attacks of Syrphus 

 larvae which were very common. 



