ECONOMIC ZOOLOGY ENTOMOLOGY. 757 



adults prefer to suck the thick bark ot the trunk and larger boughs, but the 

 nymphs will feed on various plants. From .50 to 100 eggs, usually about SO, 

 are contained in each oiitheca, deposited on the trunk or one of the larger 

 boughs of a longan tree or mango. "The eggs hatch in about 26 days, the first 

 molt occurs iu about 24 days from hatching, the next three molts at intervals 

 of about 15 days, and the final molt in about 40 days, the entire nymphal 

 period being about 109 days, and from laying of egg to adult insect about 135 

 days." 



A mite is said to live in the wax which collects over the spiracles and in the 

 wax pockets. The larvre of a moth {Eijipyrops anomnla) are parasitic on the 

 adult Pyrops, 2 or 3 larvae often being found on one candle fly. The eggs are 

 said to be pax-asitized. probably by chalcidids. 



Notes on three species of Jassidae, R. L. Websxeb (Ent. News, 21 {1910), 

 No. 6, pp. 26-5-26S). — Biological notes upon Empoasca obtusa, E. inali, and 

 Typhlocyha rosw are presented. 



A revision of the American species of Platymetopius, E. P. Van Duzee 

 (Ann. Ent. Soe. Awcr., 3 (1910). No. 3, pp. 21.'i-231). — Twenty-six species of 

 this jassid genus are described, of which 4 are new to science. 



Investigations of Toxoptera graminum and its parasites, F. M. Webster 

 {Ann. Ent. Soc. Amer., 2 (1909), No. 2, pp. 61-81, figs. i3).— Substantially noted 

 as Circular 93 of the Bureau of Entomology of this Department (E, S. R., 

 19, p. 4.52). 



The life cycle of Hormaphis hamamelidis, T. H. Morgan and A. F. Shull 

 (Ann. Ent. 8oc. Amer., 2 {1910). No. 2, pp. lU-146). — The authors' observations 

 show that the birch is not a uecessaiy link in the life cycle of this aphid. 



Gall aphids of the elm, Edith M. Patch {Maine Sta. Bill. 181, pp. 193-2^0, 

 pis. 13). — In this work the author has correlated the previously existing records 

 relating to the gall aphids of the elm so that they are presented as a unit. " The 

 original descriptions of all the species have been quoted verbatim, as these are 

 for the most part no longer available and a reference to them is necessary. Some 

 entirely new data, for the most part slight, I have been able to add to each of 

 the old species considered." 



Seven species are thus treated, namely, Colopha ulmicola, Tetraneura graminis 

 colopitoklca. T. uhnisaccnU n. sp.. T. ulmi, Pemphigus ulmifusus, Sehisoneura 

 amerieana, and 8. rilciii. The information furnished includes an account of the 

 fate of the migrants of .S'. amerieana and the relation of this species to rilei/i, the 

 complete life cycle of T. graminis eoloplioidea and of C. ulmieola. the relation of 

 C. nlmieola and T. graminis eoloplioidea. whether distinct species or dimorphic 

 forms of the same, the fate of the migrants of P. ulmifusus, and T. ulmisaeeuli 

 and their alternate hosts, and the relation of the American species to the cor- 

 responding EuropeaTi species. A bibliography arranged chronologically is given 

 for each species. 



Four rare aphid genera from Maine, Edith M. Patch {Maine Sta. Bui. 182, 

 pp. 2'il-2.'i8. Ills. G). — Descriptions are given of 3 European species collected by 

 the author at Oronto, Me., viz, Sipha glyeeria; collected from rush (Juneus sp.), 

 Mindarus ahietinus from leaves of white i)ine. balsam fir and si)ruce. and Sym- 

 dobius oblongus found to be gregarious ujion the branches of birch (lirtula 

 papyifera) . M. ahietinus is said to develop in curled ti|is of Abies balsamea and 

 Picea canadensis. It migrates from infested P. canadensis twigs about mid- 

 .Tune. immediately after acquiring wings. 



A descrii>tion is also given of Mastopoda iitrridix, ;i species recordeil in ISSO 

 from Minnesota, which has been collected by the author near Orono from the 

 brake fern. 



