764 Pomona College Jocrx-U. of Entomology 



MONELLIA Oestlund. 1887 

 Type Aphis caryella I~itch 



Body — Long and tapering, forehead raised in tlie middle and projeeted at 

 the inner side of the base of each antenna. 



Axfeiiiiap — 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 ineasureinents: for the 

 base 0.20 mm., spur 0.15 mm., Aphid. ;\Iinn. 45, 1887.) 



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



Cornicles — Little more than pores, sometimes very indistinct. 



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



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

 shaped area between the two distinct lobes. 



Key to California Species 



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



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



Antenna^ longer than the body; articles III-VI dark throughout: tibtv 



and tarsi of legs dark. californicus 



M. caryae (I\Ionell) Gill. On Black Walnut, Berkeley, California. First 



reported by Clarke. Can. Ent., XXXV, 249, 1908. Davidson reports this 



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



regia L.). Jr. Ec. 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 Paula, California. 



(See description.) 



Myzocallis alni (Fabr. ) Passerini 

 (Small Alder Louse) 



1794 Ai>his aliii Fabr. Ent. Syst. IV. 215. Syst. rliyng. 298. 



^4p/(i'.s- aliii De Geer Uberes, III, 32. 



1837 Aphis mnculata Heyd. ilus. Sankerberg II, 297. 



1843 Aphis abii Fabr. Kalt. Jlonogr. 137. 



1857 Calliptcrus alni Fab. Kcch. Pflz. 211. 



1860 Pterocalli.s alni Pass. Gali Afiidi 28. 



1880 Pterocallis alni Fabr. Buck Brt. Aphid, III, 31. 



1905 Pterocallis alni F-Ahr. Sellout. Aphid. Belg. 210. 



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



1910 Callipliriis alni Kab. Davis. .Ir. Ec. Ent., 111. 41(i. 



wiNGW) vivu-AHors FicMAi.E (Figure 1243. A) 



Length of the body 1.2 mm., width of the mesothorax 0.37 mm., widtli of 

 the ai)domen 0.5 mm., wing expansion 3.57 mm. Body — Very small, light in 

 color, fiat, smooth in winged and tubcrculate in apterous forms. Pr( railing 

 color — very light to saffron yclhiw witii green bldtdies on the abdomen. Iliad 



