528 



maize. If oats or barlev are on the ground in the year of the May 

 beetle flight, the soil will contain many grubs, but as the following crop 

 of clover is but little injured by them no harmful results will follow. 

 If the ground is covered with clover during May and June of a \ear 

 when May beetles are abundant, few eggs will be laid and maize can 

 be safely grown ; while if maize is grown in the year that beetles are 

 abundant, the ground must be carefully cultivated during their flight, 

 and in the following year barley or oats would follow, which are but 

 little injured by the grubs. 



Young (B. P.). Ecological Notes on the Spring Canker Worm 



{Palaeacrita vernnta, Peck.) — Canadian Entomologist, London, Ont., 

 1, no. 8, August 1918, pp. 267-277. [Received 12th October 1918.] 



A series of experiments is described with Palaeacrita vernata, Peck, 

 (spring cankerworm), collected from l)r beneath tanglefoot bands 

 on elm trees in Kansas, where this moth had been so abundant in the 

 preceding season as to cause complete defoliation of many trees. 

 Tables are given recording the results. The evidence indicates that 

 the minimum temperature at which adults can emerge from the 

 ground is between 20° and 25° F. , while an average daily temperature 

 of about 45° F. is apparently fatal to the hatching of eggs. The 

 average incubation period of the eggs was found to be 26 days. The 

 number of eggs laid by each female under the conditions of the 

 experiment was surprisingly low, being 83 on an average, though 

 dissections have revealed as many as 400 per female. Some 20 per 

 cent, of the eggs deposited proved sterile. It is suggested that the 

 results of similar experiments in other localities would be interesting 

 for comparison. 



Garnett (R. T.). An Annotated List of the Cerambycidae of California. 



— Canadian Eyitomologist, London, Ont., 1, no. 8, August 1918, 

 pp. 281-284. [Received r2th October 1918.] 



This list of Californian Cerambycids, which is continued from a 

 previous paper [see this Review, Ser. A, vi, p. 441] includes Ipochus 

 fasciatus, Lee, taken under the bark of dead willow and oak ; 

 Monocho,mus {Monohammus) maculosus, Hald., taken from the bark 

 of Pinus fonderosa ; SynapJioeta guexi, Lee. , bred from limbs of buckeye, 

 chestnut and poplar ; Coenojjoeus palmer i, Lee, breeding in the 

 cactus, Opuntia ; Dectes spinosus, Say, breeding in stems of Ambrosia, 

 especially A. artetnisiae folia, in which the larvae hibernate ; Hyper- 

 jylatys californicus, Casey, bred from dry twigs of Populus monilifera 

 and P. tremuloides ; H. aspersus, S,ay, bred from apple twigs ; 

 AcantJiocinus ohliquvs, Lee, breeding in yellow pine ; A. spectabilis, 

 Lee. , breeding in yellow and other pine stumps and logs ; Pogonocherus 

 crinit'us, Lee, bred from oak; P. oregonus, Lee, believed to breed 

 in fir and Douglas spruce ; Saperda horni, Joutel, taken from willow ; 

 S. populnea, Ij., feeding on poplar ; Mecas inornata, Say, breeding in 

 stems of false sunflower and in Helianihus tuberosus ; and Oberea 

 scJiaumi, Lee, breeding in willow and cotton wood. 



