56 MISCELLANEOUS STUDIES 



Apterous oviparous female (Fort Collins, Colorado). Pale 

 throughout, with many small hairs scattered over the body. Most 

 of these hairs are simple, but some especially on the front of the head 

 and on the bases of the antennae, are capitate. Antennae slightly 

 longer than the body, pale, with VI and the apices of the other seg- 

 ments dusky. \l spur and III are subequal or either one may be 

 slightly longer than the other. These are followed by IV, V, VI base, 

 I, and II. The usual primary and accessory sensoria are present on 

 VI base, and the primary sensorium of V. Secondary sensoria are 

 present only on III, and number about nine or ten. These are small, 

 circular, but varying in size, and are arranged in a more or less 

 even line along the basal one-half to two-thirds of the segment. Beak 

 pale, with tip dusky, quite large and long, reaching to or beyond the 

 third coxae. Thorax and legs normal, except the hind tibiae which 

 are quite long, and furnished with a large number of sensoria. 

 These sensoria cover practically the whole joint. Cornicle very long 

 and large, curved outward, pale, with apex dusky, and with distinct 

 reticulations at the extreme tip. They are markedly larger than in 

 the alate viviparous females, being considerably longer than the third 

 antennal segment, and in some cases even half as long again. The 

 cauda is small, pale, and triangular, although somewhat larger in the 

 viviparous female. 



Measurements : bodj* length, 2.04 mm. ; width of thorax, 0.595 mm. ; 

 antennae total, 2.446 mm. ; III, 0.646 to 0.697 mm. ; IV, 0.442 to 0.459 

 mm. ; V, 0.356 to 0.374 mm. ; VI, base, 0.136 mm. ; VI, spur, 0.663 mm. ; 

 cornicles, 0.918 to 0.952 mm. ; cauda, 0.187 mm. ; hind tarsi, 0.136 mm. 



22. Genus Idiopterus Davis 

 Davis, Ann. Ent. Soc. Am., vol. 2, p. 198, 1909. Type, I. neprelepidis n.sp. 



58. Idiopterus nephrelepidis Davis 



Figure 110 



Davis, Ann. Ent. Soe. Am., vol. 2, p. 198, 1909 (orig. desc.). 

 Davidson, Jour. Econ. Ent., vol. 3, p. 376, 1910 (list). 

 Essig, Pom. Jour. Ent, vol. 3, p. 538, 1911 (list). 



Records. Nephrolepis exaltata, Santa Paula (Essig), Palo Alto, April, 1915, 

 San Diego, March to May, 1916; Riverside, February, 1917: Cyrtonium fulcotum, 

 Berkeley, March, 1915 (Essig); ferns (unidentified species of house ferns), Stan- 

 ford University (Davidson, Morrison); Viola sp., Claremont (Essig). 



This small black aphid is often found in houses and nurseries, and 

 occasionally out of doors, on the fronds of various kinds of house 



