September iSosl 



SUPPLEMENT TO PSYCHE. 



that on 2 broadly interrupted in tlie middle. 

 Hairs of tip of abdomen yellowish. 



Hab., on Salix (narrow-leaved willow), 

 by the acequia in Las Cruces, New Mexico, 

 early in May, 1895 (Ckll., 290S). 



This species is evidently' distinct, but it 

 must be separated from its allies with care. 

 In its general appearance, and the color of 

 its wings, it resembles the $ of A. flavocly 

 peata Smith. I have an Illinois specimen 

 of the latter from Mr. Robertson, and can 

 distinguish it from salicinella by its duller 

 granulated mescthorax, not showing distinct 

 sparse punctures as in our species. The 

 clypeus also is comparatively impunctate in 

 fiavoclvpeata ; the abdominal bands also are 

 thinner. Mr. Robertson describes from Illi- 

 nois a species, A. salicis, which is evidently 

 verv near to salicinella. On going through 

 the description I find that our species difiers 

 thus : — 



The pubescence of head and thorax is 

 white or dirtv-white, not fulvous ; the basal 

 process of labrum is triangular, not truncate; 

 the wings are not clouded beyond the mar- 

 ginal cell; the abdominal fasciae are dirty- 

 white, not fulvous. Otherwise the two seem 

 to agree. 



A species I found in Wet Mountain Valley, 

 Colorado, to the best of my recollection on 

 willows, was named by Mr. Ashmead Cilissa 

 ti-izonata. A. salicinella differs from A- 

 trizonata (Ashm.) thus ; — 



The thorax is not closely punctate; the 

 pubescence is not dense; all the tarsi are 

 rufous, not black or piceous; the ocelli are 

 not pale; the wings are yellowish. I have 

 no doubt that other differences could be 

 demonstrated by actual comparison of 

 specimens. 



Perdita nitidella var. exclamans n. var. — 

 (J about 5 mm. long. Head moderately 

 broad, vertex minutely roughened and 

 sparsely punctate. Pubescence hardly 

 noticeable, but cheeks beneath bear long 

 hairs. Antennae yellow, with the tiagellum 

 black above. Vertex and upper half of 

 cheeks metallic greenish-blue. Face at and 



below level of antennae entirely pale yellow, 

 the labrum and mandibles becoming nearly 

 white, except that the latter are ferruginous 

 at tips. Above the level of the antennae the 

 yellow extends irregularly upwards, becom- 

 ing deeper in tone. The median upward 

 extension of the yellow is broad and rounded 

 and just reaches the anterior ocellus. It 

 shows a slight projection on each side not 

 far from its top; and on each side of its base 

 close to the origin of the antennae, it 

 encloses a dark spot by sending a bridge to 

 join the lateral yellow extension. The lat- 

 eral upward extension of the yellow follows 

 the margin of the orbit, at first rapidly nar- 

 rowing; and then continuing, narrow but 

 of uniform width, to its oblique termination 

 at about the level of the lateral ocelli. These 

 face-makings strikingly resemble a person 

 with uplifted arms in the act of making an 

 exclamation — hence the varietal name. 

 The median extension of the yellow repre- 

 sents the head, the lateral ones the arms. 

 If the resemblance were not so obviously 

 purposeless, I presume we should call it 

 mimicry! Prothorax yellow, neck with a 

 short dark band on each side. Pleura with 

 its anterior half yellow, its posterior half 

 covered by two large metallic blotches, 

 separated by a narrow yellow band. Dor- 

 sum of mesothoi'ax very shinj-, hardly 

 punctured, very sparsely hairy, dark metallic 

 green, with the lateral margins yellow. 

 Tegulae yellow, metathorax blue, in strong 

 contrast with the green mesothorax, sides of 

 inetathorax with white hairs; its exposed 

 dorsal surface minutely striolate. Four 

 anterior legs entirely yellow; hind legs 

 yellow with a spot at end of femur, posterior 

 side of tibia, posterior side of first joint of 

 tarsus and whole of remaining joints, dark 

 brown. Wings hyaline, nervures pale 

 brown, third discoidal cell excessively 

 indistinct; stigma hyaline margined with 

 brown. Abdomen yellow with a brown 

 band at apex and base of each segment. 

 Venter entirely yellow. 



Hab. Close to the Agricultural College, 



