548 



The internal parasites of externally feeding bir\'?p. also transform to ont«i<le pnpse 

 in a few instances, as with tlio Eiilojihiue genera Cralolcchiis and Sywpiecuz, and prob- 

 ably with other genera of this subfamily. * * * 



The Chahidid larva', which feed externally on outside feeding larva; (and we know 

 only one genus — Kuplcrtrus — in which this habit prevails) spin a coarse, rough silk, 

 attaching the deph'ted skin of the host insect to the leaf on which it had been feed- 

 ing, and transform to pupae side by side in a regular transverse row in the silky 

 mass. » * » 



The larva? of the closely allied genus Elacliistus pupate externally, but do not 

 spin the loose silk characteristic of EupUctrux. 



The hitherto accepted observation tliat Coryna davafa spins a true 

 cocoon is refuted. From cocoons like tliose described as belonging; to 

 Coryna, insects of the Ajdiidid genus rraon have been bred. 



The figures accompanying the article illustrate a larva of lAthocolht is 

 Avhich has been infested by Copidosoma; a Coccinellid larva infested by 

 Homalolyins ohncnrus^ a leaf mine of LithocoUetis hamadryndclla with 

 toj) removed showing pupa of Chrysocharis singuloris and supporting 

 pillars; pupae and adult female of Cratotechiis sp. ; pupje of Elachistus 

 spilofiomotis attached to shrunken larva of Spilosoma rirginica; and a 

 cocoon of rraon. 



Notes on grass insects in Washington, D. C, H. Oshorn (pp. 107, 108). — 

 Brief notes on a number of species observed on a lawn in August, 

 1800. Cieadula qnadriUneata was especially abundant and accominmied 

 by G. nigrifrons, which occurred in considerable numbers. 



An interesting aquatic hug (pp. 108--00). — An illustrated description 

 of an undetermined Hydrobatid water bug found by J. L. Zabriskie of 

 Flatbush, Long Island. 



Ilominirorons habits of the screir uonii in St. Louis, M. K. Murt/cldt 

 (pp. 200, 201). — An account of a case in wliic li over two hundred larvae 

 of the screw worm were taken from the nasal cavities of a woman. 



Another spider-egg jtarasifr, L. O. Jfoirard (p. 202). — A description of 

 Acoloides emertonii. n. S]>., reared l»y .1. 11. Ijuerton from the egg cocoon 

 of an unknown S])i(ler. 



DIVISION OF BOTANY. 



Bulletin N<». 12. 



Grasses of the Southwest, Part II, G. Vasey (plates r)0). — 

 This is the second half of the first volume of the Illustrations of North 

 American Grasses. For an abstract of the first half of this volume see 

 Experiment Station Kecord, vol. ii, p. 250. The second part includes 

 plates and descriptions of fifty additional species of the grasses of the 

 desert region of western Texas, New Mexico, Arizona, and southern 

 California, as follows: Aristida purpurea, Chloris suartziana, Cottea 

 pappophoroides, Diplachne fascicularis, D. imhricata, D. reverchoni, D. 

 rigida, J), riscida, Elionurus tripsacoides, Elyjnus sitanion, Eragrostis 

 curtipediceUata, E. lugens, E.o.rylepis, E.purshii,IIilaria rigida. J.ycurus 

 phleoides, Muhlenhergia hucMeyana, M. depaupcrata, M. nco mexicana, 

 M. schaffncri, Munroa squarrosa, Oryzo2)sis ^fimhriata. 0. membranacea. 



