294 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



Cauda .14 mm. Antennse; III .21 mm. to .26 mm., IV .14 mm. to .17 mm., V .14 mm- 

 to .17 mm., VI .11 mm. to .12 mm., filament .27 mm. to .31 ram. 



Apterous viviparous female (Fig. 16, 12-14). Light green: antennae, legs, 

 cornicles, cauda hyaUne greenish white; knees briefly and antennal VI entirely, 

 dusky grey; eyes red: prothorax with prominent lateral tubercles: a pair also on 

 seventh abdominal segment: beak pale, apex dusky, reaching beyond second coxae. 

 Length of body 1.23 mm. Width .67 mm. Cornicles .27 mm. Cauda .19 mm. 

 Antermae; III .16 mm., IV .14 mm., V .13 mm., VI .11 mm., filament .21 mm. 

 The pupa is pale green with light-colored wing-pads. 



This species was taken at Walnut Creek, Cal., curling terminal 

 leaves of cultivated red currant in June, 1915. What appears to have 

 been the same species was collected at San Jose, Cal., in May, 1912, on 

 the same host. Mr. A. C. Baker, Washington, D. C, to whom speci- 

 mens were sent, compared these with the type of A. neoi-mexicana 

 Ckll. and has written that the two varieties are very similar except 

 that the California specimens have a longer distal antennal joint and 

 slightly larger sensoria. The species is evidently near Aphis sanborni 

 Patch and Aphis ribis Sanborn, It differs from the former in the 

 comparative lengths of antennal joints and cornicles and from the 

 latter in its comparatively longer beak and in the sensoriation. The 

 infestation at Walnut Creek was confined to a single small currant 

 bush and was first noticed about the end of May. Before the end of 

 July the lice had been entirely wiped out by predators. Late in the 

 fall a few ovipara? of a species of Aphis were observed on the bush, 

 but the species could not be identified. At the same time migrants and 

 sexes of Myzus cynosbaii Oestlund occurred on the plant. 



Type: U. S. National Museum Catalogue No. 20072. 



Myzus ribifolii sp. nov. Fig. 16, 15 to 28. 



Stem mother (Fig. 16, 15, 16). Stout and broad; ground color pale green; head, 

 band of prothorax, thorax, and disk of abdomen brownish-black; the lateral margins 

 of the abdomen and that part of the disk caudad of the cornicles (except a median 

 band on seventh segment) pale green; the dark color predominates; under side of 

 body pale green ; cornicles, tip of cauda, coxae, trochanters, knees, tibiae and tarsi dark 

 brownish-black; antennae pale green, articulations dusky brown: antennae on obvious 

 frontal tubercles which are slightly gibbous; first joint rather obscurely toothed; 

 antennae from half to two-thirds the length of the body; III longer than the filament 

 of VI, but shorter than whole of VI; V slightly exceeding IV; beak pale, tip dusky, 

 reaches to second coxae: cornicles imbricated for their entire length, slightly thickened 

 at base: cauda slightly shorter than cornicles, ensiform, the apex rather bluntly 

 rounded : hairs on forehead and antennae long, those on body and legs shorter, in all 

 places moderately abundant, very indistinctly capitate. Length of body 2.13 mm. 

 Width (metathorax) 1.30 mm. Cornicles .21 mm. Cauda .19 mm. Beak .50 mm. 

 Antennae; III .27 mm. to .29 mm., IV .16 mm., V .17 mm., VI .09 mm., filament of 

 VI .23 mm. 



Stem mothers were collected at Redwood Canyon, near Walnut 

 Creek, Cal., towards end of March, 1915, in curled and blistered foliage 



