668 EXPERIMENT STATION RECORD. 



noted iii portions of Colorado and Kansas and in the central half of 

 Nebraska, western Iowa, and some parts of South Dakota and Minne- 

 sota as very plentiful. At Lincoln it showed a tendency to migrate 

 during - the month of September. In Colorado and western Kansas the 

 hoppers were found to be attacked by Empusa gryllce and consequently 

 upon the decline. At Colorado Springs and vicinity Melanoplus lalcinus 

 seemed to be on the increase and to have apparently passed the danger 

 line. Dissosteira longipennis was especially noted as having attacked 

 cultivated plants not before included in its list of food plants. In the 

 vicinity of Lodge Pole fields of small grain were destroyed by it; some 

 corn, potatoes, and a number of garden plants were destroyed by it. 

 In the vicinity of Sidney large numbers of a long-legged tachnid fly 

 were found apparently attacking and destroying the locusts. 



Some iit.sect.s affecting the hop plant, L. 0. Howard (pp. 10-51). — Brief 

 notes on the hop plant borer (Hydrcscia immanis and Hypena humuli), 

 the semicolon butterfly {Polygonia interrogationis), and comma butter- 

 fly (P. comma). 



The plum plant louse (Myzus mahaleh), T. Pergande (pp. 52-59). — 

 Myzus is to be distinguished from Phorodon by gibbous frontal tuber- 

 cles and the absence of a tooth in the first antennal joint in the case of 

 Myzus and by the tubercles being prolonged into a permanent slender 

 prorected tooth and by the first antennal joint being bluntly but dis- 

 tinctly gibbous in the case of Phorodon. The food plants of various 

 species and the life history of M. mahaleh are considered and the char- 

 acteristics of the insect in each of its 3 different genera described in 

 detail. The apterous females sometimes occur in the third generation, 

 but differ from those of the second nearly as much as the second from 

 the first generation. They are very similar and are to be considered a 

 migratory form destitute of wings. Return migrants or pupiferous 

 females are said to resemble closely those of previous generations, but 

 they are generally larger and stouter and have all the markings more 

 intensified. By the time the earliest sexual females are fully matured, 

 which may be in about 3 or 1 weeks, the return migrants again become 

 numerous and last until about December. 



The rose leaf beetle, F. H. Chittenden (pp. 60-61). — The author notes 

 that Xodonota puneticollis has been confounded with A. tristis, A. cly- 

 pealis, and A. eonvexa. The different species may be identified by 

 recollecting that A. tristis feeds on Lespedeza, Ceauothus, and other 

 upland weeds; A. clypealis on ambrosia in river bottoms; A. eonvexa in 

 the same situations, and A. puneticollis on wild and cultivated roses, 

 blackberries, raspberries, strawberries, and red clover. He proposes 

 to call this species the rose leaf beetle, since it seems to prefer that 

 plant. 



A case of excessive parasitism, L. 0. Howard (pp. 62, 63). — The author 

 describes a new species (Coccophagus Jlctcheri) and records that from 80 

 specimens of Lecanium Jletcheri received on 4 little twigs of Arbor vitte 



