198 ENTOMOLOGICAL NEWS. [May, 'lO 



now very hyaline, and hard to measure, the transition between 

 6 and 7 very gradual. Antennal measurements as follows : 



III IV V VI VII Nectaries 



0.585 0.442 0.471 0.142 0.928 0.042 mm. 

 0.585 0.414 0.428 0.142 1.285 mrn - 



1.170 mm. 



"Glycerine jelly mounts, with edges hardened with bichro- 

 mate." 



The Tuberculate Hickory Plant Louse (Callipterus caryacfo'iae n. sp ). 



This characteristic aphid was found rather common on the 

 upper surfaces, and occasionally on the under surfaces, of the 

 leaves of hickory at Lake Forest, Illinois, June 24, 1909. It is 

 sporadic, is very active and easily disturbed, moves about quite 

 rapidly, and has a remarkable ability for leaping. Only winged 

 adults were found. 



The writer recently had the privilege of examining specimens 

 of a hickory plant-louse in the collections of Mr. Monell, which 

 proved to be the species here described. These specimens 

 were collected by Mr. Monell on hickory at Mine Lamotte. 

 Missouri, 1 8 years ago. He has kindly offered the use of his 

 notes which I give in full at the end of the description. 



It is with some doubt that I place this species in the genus 

 Callipterus, which, except for the comparative length of anten- 

 nal segment VI filament, might belong to Mordvilko's genus 

 Tuberculatus. In Dr. Mordvilko's table* this species runs 

 down to Callipterus. 



Winged viviparous female Entire body, including head, velvety 

 black or dark brownish, usually the former. Immediately after mount- 

 ing in balsam the body appears brownish or light brown, and the tuber- 

 cles show up as black markings. On the thorax are two small white 

 pulverulent spots. Also on the abdomen near the anterior part are 

 two similar white spots, and at the posterior end is a mass of white 

 pulverulence. In addition, there were several inconspicuous dots on 

 the abdomen. The head bears two inconspicuous tubercles on the dor- 

 sum, one on each side of the median. (PI. VIII, fig. 8). On the pro- 

 thoracic segment are two pairs of dorsal tubercles, the anterior pair 

 being similar to that on the head and the posterior pair larger. On 



'Tables for the determination of groups and genera of Aphididre. 

 Ann. Pep. Zonl. Museum, Imperial Acad of Learning, St. Petersburg, 

 Vol. XIII, igoR. 



