22 BULLETIN 844, U. S. DEPARTMENT OF AGRICULTURE. 
AT ARLINGTON, VA. 
Neuroptera. — Perithemis domitia Dm., Enallagma sp. 
Hemiptera. — Adelphocoris rapidus Say, Lygus pratens.is 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 melinus Hubn., Colias philodice Gdt. (the common 
sulphur butterfly), Tarachidia caudef actor Hubn., Pyrameis 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 bimaculata Lep., Polistes pallipes 
Lep. (paper wasp), Megachilesp. (leaf-cutter bee), Coelioxys octodentata Say, Xylocopa 
virginica Drury (common carpenter bee), Pompiloides sp. , Apis melliftca 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., Physocephala tibialis Say. 
AT AMES, IOWA. 
Hemiptera. — Lygus pratensis Linn., Adelphocoris rapidus Say, 
Coleoptera. — Coccinella transversoguttata Fabr. 
Lepidoptera. — Eurymus eury theme Bdv., Chrysophanus sp., Lycaena (2 species),. 
Libythea bachmani Kirtland, Pieris rapae Linn. 
Hymenoptera. — Angochlora sp., Apis mellifica 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., Isodontia 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 their 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 
