850 EXPERIMENT STATION RECORD. [Vol. 37 



261-267, figs. 6). — A summary of information on Macrosiphum solatUfolii, the 

 first destructive outbreak of which in Ohio took place during 1917 and similar 

 outbreaks occurred in Illinois and Missouri. In the vicinity of Cincinnati the 

 attack, which started about the first of June, was so severe that within a few 

 weeks entire fields were brown and dead. It was first observed to attack early 

 potatoes and later spread to include early tomatoes and a rather wide range of 

 host plants. Where potatoes were badly infested the vines were completely 

 killed, while lighter infestations resulted in curling and distortion of the tops 

 which stunted the plants and materially decreased the yield of tubers. On 

 tomatoes the leaves were affected, but the main injury was to the blossom stems 

 where the plant lice collected in enormous numbers, causing the blossoms to 

 fall so that no tomatoes set. In one tomato field an expected return of about 

 $900 an acre was reduced to not more than $100 an acre. 



In control work in the Cincinnati district the most satisfactory material 

 was nicotin sulphate used at the rate of 1 to 2 teaspoonfuls to 1 gal. of water, 

 or a half pint to 50 gal. of water, with enough soap added to form suds. When 

 desired nicotin sulphate may be used in combination with lead arsenate or 

 Bordeaux mixture, or in a mixture of both, but when combined with either or 

 both soap should not be used. Several applications should be made, preferably 

 every other day for perhaps four or five times, depending upon the weather, 

 in order to insure the destruction of the plant lice. The importance of directing 

 the spray upward to reach the plant lice on the underside of the leaves is 

 emphasized. 



Some sensory structures in the Aphididae, A. C. Baker {Can<jd. Ent., ^9 

 {1911), No. 11. pp. S78-381 fig.«. ^S). 



Eastern aphids, new or little known, I, Edith M. Patch (Jour. Eron. Ent., 

 10 {1917), No. 4, pp. 416-420, fig. 1). — This paper, ba.sed largely on a coUoction 

 of Connecticut plant lice, includes descriptions of Aphis viburniphila n. .<;p. 

 from several species of Viburnum, A. rumcTicolens n. sp., from Ritnicx aceto- 

 sclln, and Prociphilus approximatut n. sp., from white ash. 



Eastern aphids, new or little known, II, A. C. Baker {Jour. Econ. Ent., 10 

 {1917), Ne. 4. pp. 420-4SS, fig. 1). — This second paper includes keys to the 

 American species of several genera, namely, Myzocallis, Monellia. Euceraphis, 

 Chaitophorus. and Pterocomma. Five species are described as new to science. 



The Aphididae of Java, P. van der Goot {hi'it. Sci. Buitcnzorg, Contrih. 

 Faiine Indcs N^eriand., 1 {1917), No. S, pp. ISOI, figs. 52). — This summary of 

 the knowledge of plant lice in Java Includes descriptions of 2 new tribes, 14 new 

 genera, and 54 species new to science. An index to the species of plant lice thus 

 far known to occur in Java, namely, 82 species representing 34 genera, and a 

 host plant index of the same are included, as is a list of 21 references to 

 literature. 



[Studies of pediculi] {rarasitoingy, 9 {1917), No. 2. pp. 22S-265, 295-^24. pis. 

 2, fig-f. 16). — Several papers relating to pediculi, here presented, include A Con- 

 tribution to the Bionomics of Pcdi<'ulus hum/inus (t'cstitucnti) and P. capitis, 

 by A. Bacot (pp. 228-258), consisting of a detailed report of life history studies, 

 given to a large extent in tabular form; Notes on the Biology of /'. humauu.^, 

 by E. Hindle (pp. 259-265) ; and Studies on Pediculus. — I, The Copulatory 

 Apparatus and the Process of Copulation In P. hvnwnus, by G. H. F. Nuttall 

 (pp. 298-324). 



The louse problem, A. W. Bacot {Brit. Mrd. Jour., No. 29S1 {1917), pp. 296, 

 2.97 ).— The data here presentt^l are based upon the studies above noted. 



The isolation of the Bacillus typhi-exanthematici from the body louse. 

 P. K. OuTSKY. B. S. Denzer, and C. E. Hush {Jour. Amcr. Mrd. Askoc, 68 

 (1917), No. 16, pp. 1165-1168). — "Since 1910 many observers in different parts 



