206 



Malloch (J. R.). Forest Insects in Illinois. I. The Subfamily Ochthi- 

 philinae (Diptera, Family Agromyzidae).^^?///. Illinois State Nat. 

 Hist. Survey, Urbana, xiii, art. 14, January 1921, pp. 345-361, 

 2 plates. [Received 16th February 1922.] 



This paper is intended to serve as an index to the habits and the 

 systematic relations of certain Agromyzidae, and contains a complete 

 series of records of the larval habits. The subfamily Ochthiphilinae 

 contains only seven genera, of which four are known to occur in Illinois, 

 the others being more southern in their distribution. Except for the 

 genus Cryptochaetum, they have not been considered of economic 

 importance. 



The predacious habits of the larvae, which feed on Aphids and Coccids, 

 do not occur in any other subfamily of the acalyptrate Diptera, but are 

 found in all species of the genus Lencopis, and it is possible that owing 

 to their small size these flies have been largely o^•erlooked. Keys are 

 given to the genera of the subfamily and to the North American species 

 of the genera Pseudodinia and Lencopis, sens. lat. 



The new species described are Leucopis pemphigae, reared from a 

 gall of Pemphigus sp. ; L. piniperda, on Pinus scopulorum and other 

 pines, and probably predacious on Aphids ; L. orbatalis, reared 

 from a pine twig infested with Kermes ; L. major; L. parallela; 

 L. minor; L. americana feeding on Aphids on black locust. Spiraea 

 vanhouteii and apple, and also on Aphis rumicis on thistle ; Leucopis 

 (Leucopomyia) pulvinariae, subgen. et sp. n., reared from larvae 

 feeding on Pulvinaria vitis, L. (cottony maple scale) ; and L. [Neoleu- 

 copis) pinicola, subgen. et sp. n., taken on pine trees and probably 

 predacious on Aphids. 



Flint (W. P.). Bum the Chinch-bug. — Illinois Univ. Coll. Agric, 

 Urbana, Extens. Circ. 28, revd. edn., December 1920, 7 pp., 4 figs., 

 1 map. [Received 16th February 1922.] 



The wholesale burning of rubbish in which they hide in winter is 

 recommended against chinch bugs [Blissus leucopterus], with which 

 Illinois is now dangerously infested. 



BuRLisoN (W. L.) & Flint (W. P.). Fight the Chinch-bug with 

 Crops. — Illinois Univ. Coll. Agric, Urbana, Extens. Circ. 30, 

 February 1919, 14 pp., 7 figs. [Received 16th February 1922.] 



One of the most effective ways of checking the chinch bug [Blissus 

 leucopterus] would be to abandon the growing of maize, and to sub- 

 stitute crops on which this pest will not feed. Some of these include 

 soybeans, cowpeas, beet, buckwheat, sunflowers and rape. 



Flint (W. P.) & Burlison (W. L.). Crop Rotations to starve the 

 Chinch-bugs. — Illinois Univ. Coll. Agric, Urbana, Extens. Circ. 

 39, August 1920, 4 pp., 1 map. [Received 16th February 1922.] 



The life-history and food habits of the chinch bug [Blissus leucop- 

 terus] are recorded, together with some rotations of crops best adapted 

 for the infested areas in Illinois, and so arranged that the minimum 

 damage by these insects will result. 



