756 EXPERIMENT STATION RECORD. [Vol. 41 



None of the dust mixtures gave results comparable to the liquid spray, 

 owing to the mechanical impossibility of driving the dust into all the hiding 

 places of the insect, due to the large size of the leaves at the time. All the 

 dust mixtures, however, seemed to destroy the insects whenever they came in 

 contact with them, although the green apple bug was practically unharmed. 



Spray pink and green potato aphids, E. M. Patch {Fotato Mag., J {I'Jli)), 

 No. 12, pp. 8, 9, 31, fiys. 2).— A brief summary of information on Macroslphum 

 solanifolii, in which the more recent work with remedial measures is discussed, 

 including references to the work in Ohio by Houser et al. (E. S. R., 38, p. 462), 

 and in Connecticut by Britton and Zapi)e (E. S. R., 41, p. 162.) 



On the life history and bionomics of Myzus ribis (red currant aphis), M. D. 

 Haviland {Proc. Roy. Sop. Edinb., 39 (1918-19), No. 1, pp. 78-112, figs. 10).— 

 The studies here reported have been summarized by the author as follows: 



"M. ribis (red currant aphis) on Ribes rubrvin is dimorphic in respect of 

 certain features of the antenna and of abdominal antl wing dimensions. The 

 nature of the food, whether healthy or blistered by the attack of the fundatrix, 

 seems to be the determining factor of this dimorphism. The form from healthy 

 leaves is probably identical with M. tchitei and J/, dispar. 



"M. ribis is migratory, and in summer colonizes certain Labiatte and other 

 weeds; but this migi-ation is not obligatory, and the entire life cycle may be 

 passed on currant. On its summer host plant this species has been previously 

 described as Phorodon galcopsidis. 



" There is a decline in fertility in the later part of the summer among the 

 forms remaining on currant. This is caused by a lower birthrate, and not 

 by the shortening of the life of the parent. This decline, together with the 

 attacks of predacious and parasitic enemies, accounts for the frequent disap- 

 pearance of the species from currant in August and September. 



" Both sexual forms may be produced, and eggs may be laid, on either host 

 plant. Males transferred from Labiatse to Ribes can fertilize the females on 

 the latter plant." 

 A small braconid, Aphidius ribis, is its principal enemy in England. 

 A bibliography of 28 titles is included. 



Observations on some mealy bugs (Hemiptera; Coccidse), G. F. Ferris 

 (Jour. Econ. Ent., 12 (1919), No. 4, pp. 292-299, figs. 3).— The data here pre- 

 sented, which supplement the systematic account previously noted (E. S. R., 

 40, p. 262), deal largely with species which are already of economic importance 

 or may be regarded as awaiting only a favorable opportunity to become so. 



It is pointed out that the name Pseudococcus citrophUus given by Claussen 

 to the so-called citrophilus mealy bug must give way, as the species was first 

 described by Green as P. gaJiani from specimens taken from Ribes sanguinea 

 in London, England. P maritimus of Ehrhorn (= P. balceri Essig) has been 

 reported by Green to occur on various plants in greenhouses in England and 

 by Chaffin from sweet potato, tomato, and avocado on the Dry Tortugas Islands, 

 near Key West, Fhi, P. pini is recorded from this country for the first time, 

 having been collected on pine in a Japanese nursery at Oakland, Cal. 

 P. bromeliw appeans to have become established in Florida, where si>ecimens 

 having been collected from the roots of bananas at Florence Villa, pineapple 

 at Frost Proof, and citrus at Ft. Meyers. P. i-irgatus, a species previously re- 

 corded from cactus and other plants at Brownsville, Tex., has been taken from 

 magnolia and mulberry at Gainesville, oleander at Key West, and an unde- 

 termined plant at Winter Haven, Fla. P. coDistocki, a dangerous mealy bug 

 originally described from specimens taken from mulberry and maple in Japan, 

 is said to occur in the eastern part of the United States, and has been collected 



