IOWA ACADEMY OF SCIENCES. 



131 



thorax with a narrow black Hue ou the anterior dorsal margin; eyes Ijrick 

 red; legs dusky; wing insertions yellow, apex of beak dusky, remainder, 

 unicolorus with body. Cauda distinct. The median dorsal glands larger 

 than either the lateral or the submedian. 



Pupa— Length of body, 3:09 mm.; width. 1.39 mm.; length of antennre, 

 .83 mm ; separation between joints, III and IV, not distinct: sensoria, not 

 distinct. Cauda, distinct, .22 mm. long. Rostrum reaches second coxce. 

 sometimes beyond. 



Color— (Unmounted, examined with band lense.) Yellowish green; wing 

 pads, whitish. (Mounted, examined with compound microscope.) Whole 

 body light green with a yellow tinge, sometimes yellowish white, depend- 

 ing on age after moulting; antenna?, wing pads and legs whitish; eyes, brick 

 red. The last abdominal segments are crescent shaped, producing an 

 indenture each side of the cauda. 



Fundatrix — Length of body, 3.66 mm.; width, 2.74 mm.; length of anten- 

 na\ .87mm. (Joint I, .087 mm.; II, .12 mm.; Ill, .24 mm.; IV, .14 mm.; V, .14 

 mm.; VI with unguis, .15 mm.); separation between III and IV not distinct 

 in immature forms. Beak, barely reaching second coxte. 



Color— (To naked eye) Greenish purple; (mounted, examined with com- 

 pound microscope) olive green with a yellow tinge. 



HACKBERRY PSYLLID.E FOUND AT AMES, IOWA. 



BY CHAS. W. MALLY. 



The insects now under consideration belong to the family Psyllidae; 

 subfamily Psyllinae; and the genus Pachypsylla. The genus, according to 

 Dr. C. V. Riley, "has no equivalent in the European fauna; but some 

 allied, still undescribed, genera occur in the New World." 



The species which first attracted attention was Pachypsylla celtidis- 

 mamma. Some observations were recorded during the autumn of 1891, but 

 no regular observations were made till March, 1892. At this time the 

 weather was cold, and the adult insects were hidden away in the cracks and 

 creases of the hackberry bark. It was difficult to tind them at first, because 

 their general color closely resembles that of the bark. Large numbers of 

 the adults were found on the sticks and pieces of bark that were lying 

 around under the trees. The old hackberry leaves were examined with 

 special reference to the galls that remained over winter, and in no case was 

 a gall found that contained a living larva, proving that in this case, at least, 

 they had issued from the gall in the fall and transformed to the adult stage. 

 Some difficulty was experienced in finding the old leaves as they had prob- 

 ably been carried away by the wind. If any of the larvie fail to issue in 

 the autumn, the evidence seems to prove that they perish in the galls. 



The chief hiding-place of the adults is in the rough sheltering bark of the 



