76-1 Pomona College Journal op Entomology 



MONELLIA (Jestlund, 1887 

 Type Aphis caryella Fitch 



Body — Long and tapering, forehead raised in the middk- and projected at 

 the inner side of the hase of each antenna. 



Antevnar — Nearly as long as or longer than the body, not situated on 

 frontal tubercles, spur of article VI equal to or slightly shorter than the base. 

 (In Oestlund's description of M. caryella he gives these measurements: fur the 

 base 0.20 mm., spur 0.15 mm.. Aphid. IMinn. 45, 1887.) 



Wings — "Folded horizontally close to the body in repose." 



Cornicles — Little more than jiores, sometimes very indistinct. 



Style — Short, distinctly knobbed, with constriction below, base broad. 



Anal plate — Long, deeply constricted in the center, forming a "V" 

 shaped area l)etween the two distinct lol)es. 



Key to California Species 



AntennsB slightly shorter than, or as long, as the body; apices of anten- 



nal articles III-VI dark; legs entirely pale. caryae 



Antenna- longer tlian the body; articles III-VI dark throughout; tiiKv 



and tarsi of legs dark. californicus 



M. caryae (Monell) Gill. On Black Walnut, Berkeley, California. First 



reported by Clarke. Can. Ent., XXXV, 249, 1903. Davidson reports this 



species at Palo Alto feeding upon the common English "Walnut. (Juglans 



regia L.). Jr. Ee. Ent., II, 301, 1909, and III, 376, 1910. 



M. californicus En. sp. Taken on Southern California Wild Walnut. 



(Juglans californica Wats.) in the mountains north of Santa Paida, California. 



(See description.) 



Myzocallis alni (Fabr.) Passerini 

 (Small Alder Louse) 



1794 Ai]his alni P^abr. Ent. Syst. IV, 215, Syst. rhyng. 298. 



Aphis alni De Geer Uberes, III, 32. 



1837 Aphis mncuJata Heyd. Mus. Sankerberg II, 297. 



1843 Aphis alni Fabr. Kalt. Monogr. 137. 



1857 Callipterus alni Fab. Kcch. Pflz. 211. 



1860 PterocalJisalniPaHn. Gali Afidi 28. 



1880 I'tcrocallis alni Fabr. Buck Brt. Aphid, III, 31. 



1905 Pterocallis alni Fabr. Sehout. Aphid. Belg. 210. 



1905 Pterocallis alni Pass. Kirkaldy. Can. Ent., XXXXVII, 417. 



1910 Callipterus alni Fab. Uavis. Jr. Ec. Ent., Ill, 416. 



WINGED VIVIPAROUS FEMALE (Figure 243, A) 



Lengtli of the body 1.2 mm., width of the mesothorax 0.37 mm., width of 

 the abdomen 0.5 mm., wing expansion 3.57 mm. Body — Very small, light in 

 color, flat, smooth in winged and tuberculate in apterous forms. Prevading 

 color — very light to saffron yellow with green blotches on the abdomen. Head 



