INDEX TO VOLUME XX 



Abbella (Ittys) perditrix, n. sp., 25. 



Acartophthalmus, 3; nigrinus, 3. 



Aedes whitmorei, n. sp., 128. 



Agrilus: a new species of, from Florida, 67; 



dozieri, n. sp., 67. 



AINSLIE, C. N.: Note on the economic im- 

 portance of Samia cecropia, 150. 

 Anoplonyx, 172; canadensis, 173. 

 Anthomyid genera, habits of, 166. 

 Anthonomus grandis var. thunberiae, 78. 

 Apanteles congregatus, cocoon spinning 



habit of, 133. 



Aphis circezandis Fitch, Identity of, 130. 

 Apis tnellifica, Muscular coat of ventriculus 



of, 152. 

 Arenivaga, Two new species of the Blattid 



genus, 154; florinensis, n. sp., 156; genitalis, 



n. sp., 154. 



Argoravinia argentea, Synonymy of, 20. 

 Augomonctenus, new gen., 81; libocedri. 



n. sp., 81. 

 BAKER. A. C.: Identity of Aphis circezandis 



Fitch, 130. 

 BARBER, H. G.: Genus Plinthisus Latr. in 



the United States, 108. 

 Boll weevil, A new host plant of, 78. 

 Braconids, Notes on the cocoon spinning 



habits of two species, 133. 

 CAUDELL, A. N.: Two new species of the 



Blattid genus Arenivaga, 154. 

 Caulocampus, 105; acericaulis, 165. 

 Cephus cinctus parasitized by Microbracon 



cephi, 19. 

 Chaetoclusia, Key to species, 5; affinis, 5; 



bakeri, 5. 

 Chalcidoid Egg parasites. Three new, 23. 



Chalcis abiesae Girault, Note on, 18. 

 Chemistry, Entomological, Recent, and some 



notes concerning the food of insects, 12. 

 Chrysobothris tranquebarica Gmel. versus 



impressa Fabr., 173. 

 Chrysops, Key to species of District of 



Columbia, 193; brimleyi, 196; brunneus, 



197; callidus, 196; carbonarius, 197; celer, 



197; cuclux, 197; dimmocki, 197; fallax, 



197; flavidus, 196; indus, 196; lugens, 197; 



lugens var. morosus, 194; mitis, 194; 



moechus, 197; montanus, 197; niger, 197; 



obsoletus, 197; parvulus, 197; sequax, 198; 



striatus. 198; univittatus. 198; vittatus, 



I'.ix, vittripennis, 198. 

 Chrysotoxum coloradense, n. sp., 70. 



Clusia, Key to species, 3; czernyi. 4; lateralis, 

 4; occidentalis, n. sp., 4. 



Clusiodes, Key to species, 5; albimana, 6; 

 apicalis, 6; flavipes, 6; geomyzina, 6; 

 melanostoma, 5; pictipes, 7. 



Clusiodidae, Revision of the dipterous 

 family, 2; Family characters, 2; Habits, 

 3; Key to genera, 3. 



Cnemodon, The genus in North America, 

 127; Key to species, 127; calcarata, 127; 

 trochanterata, n. sp., 127. 



COCKERELL, T. D. A.: Some Halictine bees 

 in the U. S. National Museum, 177; A new 

 Colletid bee from Ecuador, 200. 



Cocoon spinning habits of two species of 

 braconids, 133. 



Colletes rohweri, n. sp., 206. 



CRAMPTON, G. C.: Thoracic sclerites of im- 

 mature pterygotan insects, with notes 

 on the relationships indicated, 39. 



Craterocercus, Key to species, 162; fraternalis, 

 163; infuscatus, 165; quercivorus, n. sp., 

 164. 



Culicid, A new from Colombia, 128. 



CUSHMAN, R. A.: Correct names for some 

 of our common Ichneumon parasites, 9; 

 Convenient method of handling large 

 numbers of individuals in life-history 

 studies of insects, 112; Notes on the 

 cocoon spinning habits of two species of 

 Braconids, 133. 



CUSHMAN, R. A. AND ROHWER, S. A.: The 

 genus Ephialtes first proposed by Schrank, 

 186. 



Diprion, Key to subgenera, 82. 



Diprioninae. New sawflies of the subfamily, 

 79; Key to genera, based on adults, 80. 



Diptera, Some synonymy in the Tachinidae, 

 19; Three new species of, 69. 



Drone honey bee, An eyeless, 105. 



DUCKETT, A. B.: Biography and Biblio- 

 graphy of, 185. 



DUNN, LAWRENCE, H.: A new mosquito 

 (Aedes whitmorei) from Colombia, IL'.V 



Edo, a subgenus of Magdalis, 74; Table of 

 N. A. Species, 78. 



ELY, CHARLES R.: Annual address of the 

 President: Recent entomological chem- 

 istry and some notes concerning the food 

 of insect-.. I -. 



Entomological Chemistry and some notes 

 concerning the food of insei-i*. I- 



2O9 



