TABLE OF CONTENTS OF VOLUME XX 



Page 

 AINSUE, C. N.: A note on the economic importance of Samia cecro- 



pia. (Lep.) 150 



BAKER, A. C. : The identity of Aphis circezandis Fitch. (Horn.) 130 



BARBER, H. G.: The genus Plinthisus Latr. (Lygaeidae-Hemiptera) 



in the United States 108 



CAUDEU., A. N.: Two new species of the Blattid genus Arenivaga. 



(Orth.) 154 



CocKRELL, T. D. A. : A new Colletid bee from Ecuador 206 



Some Halictine bees in the United States 



National Museum. (Hym.) 1 77 



CRAMPTON, G. C.: The thoracic sclerites of immature Pterygotan in- 

 sects, with notes on the relationships indicated . . o9 

 CUSHMAN, R. A.: A convenient method of handling large numbers of 



individuals in life-history studies of insects 112 



Notes on cocoon spinning habits of two species of 



Braconids. (Hym.) 133 



The correct names for some of our common Ich- 



numonid parasites. (Hym. ) 9 



and ROHWER, S. A. : The genus Ephialtes first 



proposed by Schrank. 



(Hym.) 186 



DUNN, LAWRENCE H.: A new mosquito (Aedes whitmorei) from Col- 

 ombia 1 28 



ELY, CHAS. R.: Recent entomological chemistry and some notes con- 

 cerning the food of insects 12 



FISHER, W. S. : A new species of Agrilus from Florida (Coleoptera: 



Buprestidae) 67 



Chrysobothris tranquebarica Gmel. versus impressa 



Fabr. Coleoptera: Buprestidae) 173 



GAHAN, A. B.: A synopsis of the species belonging to the Chalcidoid 



genus Rileya Ashmead. (Hym.) 136 



Description of a new Hymenopterous parasite (Bra- 



conidae ) 18 



Propachyncuron Girault (Hymenoptera : Chalcidoidea) 66 



Three new Chalcidoid egg-parasites 23 



GREENE, CHAS. T.: A note on the habit of Pegomyia affinis Stein and 



other Anthomyid genera 160 



Three new species of Diptera <>9 



HEINRICH, CARL : A new genus of Lepidoptera allied to Leucoptera 



Hubner 21 



On the Lepidopterous genus Opostega and its lar- 

 val affinities 27 



HYSLOP, JAMES A., with POPENOE, C. H., and SANFORD, H. L 185 



I 



