328 



in about 5 days, beginning at once to feed on grasshopper eggs and be- 

 coming engorged after 14-20 days. It again enters the soil and passes 

 through a transformation stage from which the adult emerges during 

 late August ; it may then begin feeding or go at once into hibernation. 

 The economic importance of E. locustarum is undoubtedly great, 

 the nymphs and adults destroying large numbers of grasshopper eggs, 

 though the larvae, even if present in large numbers, do little more than 

 weaken the grasshoppers to which they attach themselves. 



The adult of Microtrombidium muscarum, Riley, has not been 

 collected in Minnesota but must occur there, as what is probably the 

 larva has been found on three occasions, twice on adults of Musca 

 domestica, and once in a manure heap. 



Washburn (F. L.)- The Hymenoptera of Minnesota. — 17th Rept. 

 Minnesota Slate Entomologist, Agric. Expt. Sta., Univ. Farm, St. 

 Paul, 1st December 1918, pp. 145-237, 100 figs., 3 coloured plates. 

 [Received 21st May 1919.] 



This important work embodies the results of several years' investi- 

 gxtion, all species collected and determined up to date being listed and 

 those of economic importance being emphasised. 



Washburn (F. L.) & Howard (C. W.). Household Insects.— O^ce of 

 Minnesota State Entomologist, Umv. Farm, St. Paul, Circ. no. 44, 

 15th October 1917, 14 pp., 7 figs., 1 plate. [Received 28th May 

 1919.] 



Among the insects dealt with in this paper, which is compiled from 

 previous circulars, are Phyllodromia germanica (croton bug), clothes 

 moths, buffalo carpet beetle [Anthrenus scrophulariae], silver fish 

 [Lepisma], ants in the house and garden, and bean weevils, 



Fullaway (D. T.). Report of the Entomologist. — Rept. for the Bien. 

 Period ending 31st December 1918, Territory of Hawaii Bd. Agric. 

 & Forestry, Honolulu, 1919, pp. 54-60. [Received 3rd June 

 1919.] 



The propagation and distribution of beneficial insects have been 

 continued during the year, the species and localities to which they 

 were sent being shown in a table. This work might be very profitably 

 extended, especially for the control of the corn leaf-hopper [Peregrinus 

 tnaidis] in the lowlands, where maize cultivation is confined to the 

 winter months and where there is great destruction of the parasite 

 [Paranagrus] during the off-season. Reports of work done by the 

 United States Bureau of Entomology in the control of the Mediter- 

 ranean fruit-fly, which have been noticed in this Revieiv, are quoted at 

 length. No unusually serious insect menace appeared during the 

 period under review, with the exception of a heavy infestation of 

 bananas by mealy-bugs in the summer of 1917. Attention is drawn 

 to the alarming and increasing ravages of termites. One recently 

 observed species is becoming very destructive to all kinds of timber 

 and wood products, and a study of it is being made. 



