. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 34 BULLETIN 100, U. S. DEPARTMENT OF AGRICULTURE. MS Y&X m ;-€. Fig. 18.—o, Monellia caryw, antenna of male; b, Monellia caryella, two views of right an- tenna of male. (Original.) occurs a large black spot on the pleurae. Abdomen unarmed, pale green or green- ish yellow; segments 1 to 8, inclusive, with two dusky brown oval spots on each. Cornicles pale, concolorous with the body, very small, considerably broader than long. Cauda concolorous with the abdomen, globular. Abdomen about as long as head and thorax com-
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 34 BULLETIN 100, U. S. DEPARTMENT OF AGRICULTURE. MS Y&X m ;-€. Fig. 18.—o, Monellia caryw, antenna of male; b, Monellia caryella, two views of right an- tenna of male. (Original.) occurs a large black spot on the pleurae. Abdomen unarmed, pale green or green- ish yellow; segments 1 to 8, inclusive, with two dusky brown oval spots on each. Cornicles pale, concolorous with the body, very small, considerably broader than long. Cauda concolorous with the abdomen, globular. Abdomen about as long as head and thorax com- bined, not wider than the thorax. Beak pale, barely reaching second coxae. Sternum and underside of the eighth abdominal segment black. Measurements: Length of body, mm.; width of body, mm.; ex- panse of wings, mm.; antenna, joint I, mm.; joint II, mm.; joint III, mm.; joint IV, mm.; joint V, mm.; joint VI, mm.; filament, mm.; cauda, mm.; cornicles, mm. Described from three speci- mens, Walnut Creek, Cal., 1912 and 1913. MONELLIA CALIFORNICA Essig. Monellia califomicus Essig, Pomona Jour. Ent.,, no. 3, p. 767, Nov., 1912. In southern California feeding on the underside of the leaves of the California black walnut (Juglans californica) there has recently been found a plant- louse closely allied to Monellia caryse and M. caryella. The writer has never seen this aphis in nature, but has received speci- mens from Mr. Essig, who de- scribed it. KEY TO THE SPECIES OF MONEL- LIA KNOWN TO OCCUR IN CALI- FORNIA. The following key will serve to distinguish the four species of walnut aphides occurring in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. o
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