154 



obtained from Utah, is being reared and liberated, and seems to be 

 increasing rapidly. There is one complete generation of the parasite in 

 a 3'ear, with a partial second, and several larvae of Hypera variabilis 

 may be attacked by one parasite! Dust mulching has not proved 

 practicable, and is not recommended. The previous year's spraying 

 results have been confirmed, and the spray, to be effective, must be 

 applied when severe injury first becomes apparent. 



The latest quarantine restrictions against the transport of lucerne, 

 either as hay or packing, or for any other purpose, by means of which 

 H. variabilis might be distributed, are given, as well as a synopsis 

 of regulations existing in 1919. 



List (G. M.). The European Elm Scale {Gossyparia spuria, Modeer.) — 

 Office State Ent., Colorado, Fort Collins, Circ. 29, August 1920, 

 12 pp., 4 plates. [Received 26th January 1921.] 



In Colorado the European elm scale, Gossyparia spuria. Mod., 

 confines its attacks almost entirely to the American elm, probably 

 because the latter is the species most generally grown in the districts 

 infested. It may be classed among the most destructive pests in 

 Colorado. The partly grown larvae hibernate in the crevices of the bark. 

 They suck the sap in spring. The males emerge earl}^ in June and die 

 after mating. The females are mature at the end of June, and soon 

 begin oviposition, the eggs hatching almost immediately. In 1920 the 

 first young were seen on 24th June. They migrate to the leaves, 

 where they feed on the underside until hibernation begins in autumn. 



Spraying with miscible oil, 1 part to 15 of water, has given almost 

 perfect control. Judicious pruning and the removal of many trees 

 in places where they are overcrowded are also important points. 



ZuBER (N. D.). Division oJ Orchard and Nursery Inspection. — 11th 

 Ann. Rept. Commiss. Agric. Texas, Austin, 1st September 

 1918, pp. 45-53. [Received 26th January 1921.] 



Infestations of cottony cushion scale [ Icerya purchasi] occurred 

 in various parts of the State. Spraying and fumigation were ineffec- 

 tive, but after some difficulty an importation of the vedalia beetle 

 [Novius cardinalis] was successful in checking the pest. 



Co-operative spraying was carried out against various orchard pests, 

 and large quantities of poison were used against the Argentine ant 

 [ Iridomyrmex humilis]. 



ScHOLL (E. E.). Division o! Entomology. — 11th Ann. Rept. Commiss. 

 Agric. Texas, Austin, 1st September 1918, pp. 54-62. [Received 

 26th January 1921.] 



An extensive list of the insects noticed during the year is given. 

 Among them Typophorus viridicyaneus. Crotch, and Estigmene acraea, 

 Dru., attacked cotton. Colonies of the ant, Pogonomyrmex barbatus, 

 were treated with a solution containing 1 lb. of 98 per cent, potassium 

 cyanide to 6 U.S. gals, of water. Several applications of the poison 

 were necessary. 



