660 EXPERIMENT STATION RECORD. [Vol.38 



Farm is first reported upon by the apiarist (pp. 1151-1169), followed by reports 

 by the superintendents on bee work at the experimental farms (pp. 1169-1194). 



A table summarizing the production of bees at 14 Dominion experimental 

 farms in 1915 is included. 



Beekeeping for the fruit grower and small rancher or amateur, G. A. 

 Coleman {California Sta. Circ. 185 {1911), pp. 11, figs. S). — A popular sum- 

 mary of information on beekeeping. 



Results of cooperative experiments in apiculture, M. Pettit {Ann. Rpt. 

 Ontario Agr. and Expt. Union, 38 {1916), pp. 33-40, fig. 1).—A brief report of 

 the results of cooperative work in Ontario. 



The North American wasps of the subgenus Pemphredon, S. A. Rohwek 

 (Bill. Brooklyn Ent. Soc, 12 {1917), No. 5, pp. 97-102).— A key is given to the 

 nearctic species of Pemphredon, and descriptions of four new species and notes 

 on several others. 



The Cattleya fly, J. B. Mooee {New Jersey Stas. Bui. 308 {1916), pp. S-12, 

 pis. 2). — The hymenopteran Isosoma orchid ear um, known as the Cattleya fly, 

 which was imported -with orchids prior to 1888, is now the most serious enemy 

 of certain species of Cattleya. At first considered to be of little importance, 

 the infestations have increa.sed to such an extent that many growers have been 

 forced out of business. Its injury is caused by the larvae which burrow out 

 the interior of the young buds or young pseudo-bulbs and weaken the growth 

 to such an extent that very poor blooms or no blooms at all are produced. C. 

 mossicB and C. gaskeliana have very few injuries, while C. labiata, C. per- 

 civaliana, C. gigas, and C. triance are badly affected. 



In the author's life history studies of the pest, which extended over a period 

 of 13 months, C. labiata and C. triance, inclosed in a wire cage were used as host 

 plants. The first brood emerged the last week in February, two broods emerged 

 in March, two in April, etc. The egg is deposited beneath the epidermis at the 

 base of the young growths and the injury can be detected by a swelling. The 

 period from oviposition to emergence covers at least three months in the winter. 

 Upon hatching out the larvaj feed upon the soft interior of the pseudo-bulb, 

 forming small cavities in which they later pupate, and as many as 10 may be 

 found in the same cavity. A single female was observed to make 34' piercings 

 within 18 hours, and it is thought possible that each female lays more than 50 

 eggs during the three or four days of her life. 



In fumigation for the destruction of the advlts, which must be done every 

 night, Nicofume proved much more satisfactory than pyrethrum, though neither 

 is sufficiently effective. Spraying for the pest does not appear to be practicable. 

 In experimental injections of ether, chloroform, carbon bisulphid, nicotin solu- 

 tion, and pure air separately into infested growth, the first three killed both 

 insect and infested part of the plant. While nicotin solution killed the insect 

 in the cavity it did not permeate the plant tissues. The author found that the 

 simple piercing of the shoot, i. e., the injection of pure air into the cavity, 

 kills the insects, and he concludes that piercing the swollen portion is a satis- 

 factory method of control just so long as the cavity is exposed to the air, but 

 if the stab is made in the wrong place or if only one or two cavities are stabbed, 

 reproduction of the flies is not prevented. The destruction of the infested parts 

 appears to be the best method of control known, and in doing so all growths 

 less than 18 months old should be examined at least once a week, unless the 

 grower has not imported orchids or had no infestations for a year or longer. 



A revision of hymenopterous insects of the tribe Cremastini of America 

 north of Mexico, R. A. Cushman {Proc. U. S. Nat. Mus., 53 {1917), pp. SOS- 

 SSI). — This revision includes descriptions of one genus (Neocremastus) and 29 

 species new to science. Among the new species are Cremastus flaviceps reared 



