. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. DELTOCEPHALUS AFFINIS GILLETTE AND BALL. 83 throughout the northern United States and southern Canada and is evidently a form that was reported by Dr. Wm. H. Ashmead under the name harrimani from Alaska (report of Homoptera, Harriman Alaska expedition), DESCRIPTION. The adult msect is of a light gray or brownish-gray, often pale, but varymg so much m color that it has been many times de- scribed under diii'erent names. It is nearly one-sixth of an inch long and is to be separated from D inimicus by the absence of
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. DELTOCEPHALUS AFFINIS GILLETTE AND BALL. 83 throughout the northern United States and southern Canada and is evidently a form that was reported by Dr. Wm. H. Ashmead under the name harrimani from Alaska (report of Homoptera, Harriman Alaska expedition), DESCRIPTION. The adult msect is of a light gray or brownish-gray, often pale, but varymg so much m color that it has been many times de- scribed under diii'erent names. It is nearly one-sixth of an inch long and is to be separated from D inimicus by the absence of defi- nite black spots on the head and thorax and by the slightly smaller size. The head, too, is a little more distmctly pouited. (See fig. 18.) The most positive characters are found in the genitalia, the last venti-al segment of tlie female beuig short, nearly straight on the hind border, while the male valve is very much enlarged and convexly rounded, almost cover- ing the plates, the tips of which appear as slight projections be- yond its hind border. The nymphs are of about tlie same form as those of inimicus, but differ distmctly in that the body is uniformly light yellow without the black lateral border which is characteristic of Fig. 18.—Dellocephalus afflnis: a, Adult; b, face; c, vertex and pronotum; d, female genitalia; f, male genitalia;/, wing; ^,uympli. All enlarged. (After Osborn and Ball.) The head is bluntly angled m front and in the later nymphal stage the wing-pads expand m a rather sharp angle back to the second abdominal se£:nient. LIFE HISTORY. The life history of the species has not been determined with com- plete accuracy and is difficult to establish because of the irregularity with which the difrereiit generations appear and the overlapping of adult and nymphal stages. From observations in Iowa it was believed that there might be three or possibly four generations each year and the designation of the broods so far as they couhl be deter
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