. Bulletin of the Department of Agriculture. Agriculture. 34 BULLETIN 100, U. S. DEPARTMENT OF AGRICULTUEE. occurs a large black spot on the pleura. Abdomen unarmed, pale green or green- ish yellow; segments 1 to 8, inclufiive, 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. Measurement
. Bulletin of the Department of Agriculture. Agriculture. 34 BULLETIN 100, U. S. DEPARTMENT OF AGRICULTUEE. occurs a large black spot on the pleura. Abdomen unarmed, pale green or green- ish yellow; segments 1 to 8, inclufiive, 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, ; joint II, mm.; joint III, mm.; jomt IV, mm.; joint V, mm.; joint VI, mm.; jaiament, mm.; cauda, mm.; cornicles, mm. Described from three speci- mens, Walnut Creek, Cal., 1912 and 1913. MONELLIA CALIFORNICA Essig. Monelha californicus 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 MoneUia caryse and M. carijella. The wi-iter has never seen this aphis in natuie, 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 Fig. 18.—a, MoneUia caryse, antenna of male; h, MoneUia caryeUa, two views of right an- terma of male. (Original.). 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 Department : Supt. of Docs. , Govt. Print. Off.
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