22 BULLETIN 844, IT. S. DEPARTMENT OF AGRICULTURE. 



AT ARLINGTON, YA. 



Neuroptera. — Perithemis domitia Dru., Enallagma sp. 



Hemiptera. — Adelphocoris rapidus Say, Lygus pratensis Linn, (tarnished plant 

 bug). 



Coleoptera. — Chauliognathus marginatus Fabr. (margined soldier beetle), Diabrotica. 

 12-punctata Oliv. (southern corn rootworm). 



Lepidoptera. — Pieris protodice Bd. (imported cabbage butterfly), Heodes hypophleas- 

 Bd., Lycaena comyntas Gdt., Hylephila campestris Bd., Scepsis fulvicollis Hubn., 

 Ancyloxypha numitor Fabr., Pholisora catullus Fabr., Pyraustid sp., Loxostege similalis 

 Gn. (garden webworm), Thecla vielinus Hubn., Colias philodice Gdt. (the common 

 sulphur butterfly), Tarachidia caudefactor Hubn., Pyrantels atalanta Linn., Drasteria 

 (2 species), Diacrisia virginica Fabr. (the woolly bear). 



Hymenoptera. — Halictus lerouxi Lep., H. provancheri (sweat bee), H. pectoralis- 

 Sm. (sweat bee), Halictus (3 unidentified species), H. legatus Say, Bombus affinis- 

 Cr., B. impatiens Harris (bumblebee), Melissodes birnaculata Lep., Polistes pallipes 

 Lep. (paper wasp), Megachiles-p. (leaf-cutter bee), Coelioxys octodentata Say, Xylocopa 

 virginica Drury (common carpenter bee), Pompiloides sp., Apis mellijica Linn, (honey- 

 bee), Philanthus punctatus Say, Sphex nigricans Dahlb. (caterpillar hawk), S. picti- 

 pennis Walsh (caterpillar hawk). 



Diptera. — Archytas analis Fabr., Chrysomyia macellaria Fabr. (screw-worm fly),, 

 Pollenia rudis Fabr. (cluster fly), Ocyptera carolinae Desv., Trichophora ruficauda 

 V. D. W., Eristalis arbustorum Linn., Physocephcda tibialis Say. 



AT AMES, IOWA. 



Hemiptera. — Lygus pratensis Linn., Adelphocoris rapidus Say 



Coleoptera. — Coccinella transversoguttata Fabr. 



Lepidoptera. — Eurymus eurytheme Bdv., Chrysophanus sp., Lycaena (2 species),, 

 Libythea bachmani Kirtland, Pieris rapae Linn. 



Hymenoptera. — Angochlora sp., A pis mellijica Linn., Colletes sp., Halictus lerouxi 

 Lep., H. provancheri D. J., Halictus sp., Elis sp., Calliopsis andreniformis Smith, Polistes 

 sp., Sphex sp., Eumenes fraterna Say, Sceliphron sp., Lsodontia harrisi Fern., Cerceris- 

 sp., Oxybelus sp. 



Diptera. — Syritta sp., Paragus sp., Chrysomyia macellaria Desv., Syrphidae (2 uniden- 

 tified specimens). 



EFFECT OF MOISTURE UPON THE PRODUCTION OF MELILOTUS ALBA 



SEED. 



Careful inspection of a number of sweet-clover fields in Iowa and 

 Illinois in the autumn of 1916 indicated that many plants were 

 unable to obtain sufficient moisture for the proper development of 

 their flowers. Examination of flowers that aborted shortly after 

 reaching then mature size showed that the anther sacs had not 

 burst, even though the pollen grains were mature. Apparently for 

 the same reason many immature pods aborted. The precipitation 

 for July, 1916, in Livingston County, 111., where the sweet-clover 

 seed crop suffered materially for lack of moisture, was 3.2 inches less 

 than normal, while the temperature was 4.5° F. above normal. In 

 August the precipitation was 0.96 of an inch below normal and the 

 temperature 4.2° F. above normal. At Ames, Iowa, the precipita- 

 tion was 3.54 inches below normal and the temperature 5.4° F. above 



