19171 ENTOMOLOGY. 461 



tages resulting from spraying for the control of insect pests and mites as a 

 supplement to the benefits resulting from natural enemies are pointed out. 



The cat-tail rush, Typha latifolia, as a summer host of injurious insects, 

 W. M. Davidson (Mo. Bui. Com. Hort. Cal., 6 {1911), No. 2, pp. 64, 65, fig. 1).— 

 This rush, which serves as a summer host for a number of important pests, 

 is abundant in California along water courses, in ponds and marshes, and in 

 irrigation ditches. It frequently thrives In close proximity to orchards and 

 remains green throughout the long, dry summers while the grasses and weeds 

 in great part begin to die off in the late spring. 



The plum aphis (Hyaloptervs arundinis) is perhaps the chief insect pest 

 which feeds upon it, spring migrants arriving from plums and apricots at the 

 end of April and continuing to arrive until the end of July. The reddish- 

 lirowii plum aphis {Rhopalosiphuyn nympheo!), which occurs on plums of both 

 European and Asiatic origin, uses the cat-tail as summer host along with other 

 water plants, including Alisma, Nymphea, Potamogeton, etc. Ordinarily preda- 

 tors control this aphid quite effectively, while the smaller colonies of the mealy 

 aphis more frequently escape. The grain aphis colonizes T. latifolia during 

 the summer and fall, winged forms arriving in May and June, and another 

 such generation departing in the late autumn. Aphis avenoe, the oat aphis, is 

 another grass species that may be found on it, often in large colonies, during 

 the summer and fall. A small, black aphis, probably A. gossypii, also occurs 

 in small numbers on this host plant during the summer and fall months, mi- 

 grating forms appearing at the end of October. Red spider mites of the genus 

 Tetranychus feed on it, sometimes in abundance, during the summer months. 



Hackberry insects and their control, P. B. Paddock {Proc. Texas Farmers' 

 Cong., 18 {1915), pp. 103-106). — This is a brief summary of the insect enemies 

 of the hackberry and means for their control. 



Contribution to a study of the toxins of spiders, R. L6vy {Ann. Sci. Nat. 

 ZooL, 10. ser., 1 {1916), No. 4-6, pp. 161-399, figs. 6).— This work reviews the 

 literature and reports upon investigations conducted. 



The genera and species of Mallophaga, L. Harrison {Parasitology, 9 {1916), 

 No. 1, pp. 156).— This paper has been prepared primarily with the view of 

 placing a complete list of the systematic nomenclature of the group in the 

 hands of students of Mallophaga, no attempt having been made to bring the 

 host list up to date. The subject matter is divided into eight parts under the 

 headings of general introduction ; list of species of Mallophaga included in the 

 genera Pediculus, Ricinus, and Nirmus ; list of generic and subgeneric names, 

 valid and invalid, used for Mallophaga ; scheme of classification ; list of species 

 and subspecies, valid and invalid, of Mallophaga; bibliography; list of new 

 names introduced in this publication ; and index to genera. 



Field notes on Virginia Orthoptera, H. Fox {Proc. U. S. Nat. Museum,, 52 

 {1917), pp. 199-234). 



Fourth campaign against locusts (Schistocerca peregrina) in Algeria by 

 means of Coccobacillus acridiorum, B^guet {Bui. Soc. Path. Exot., 9 {1916), 

 No. 9, pp. 619-682). — A continuation of the work previously reported (E. S. R., 

 36, p. 356). 



The distribution of virulent cultures of C. acridiorum on the food has always 

 started an epidemic in the bands of S. peregrina. Such epizootics, however, 

 have never brought about their complete disappearance. 



The ftmgus on cacao thrips, W. Noweix {Agr. News [Barbados'\, 15 {1916), 

 No. 383, p. 430). — The fungus which occurs as a white mold on the body of 

 Heliothrips rubrocinctus in St. Vincent has been identified by R. Thaxter as 

 Sporotrichum glohuliferum. 



