[ 1921 ] 
XI. Insecta. 
Inseda. 21 
403. — Cresson, E. T. Studies in 
American Ephydridae ( Diptera ). iii. 
A revision of the species of Gymnopa 
and allied genera constituting the sub- 
family Gymnopinae. Trans. Amer. ent. 
soc. Philadelphia 47 1921 pp. 325-343 
1 plate. 
404. — Criddle, N. Some Phases of 
the Present Locust Outbreak in Mani- 
toba. Ann. Rep. Ent. Soc. Ont. 
Toronto 51 1921 pp. 19-23. [Orthoptera.] 
405. — Criddle, N. The Entomological 
Record, 1920. Ann. Rep. Ent. Soc. 
Ont. Toronto 51 1921 pp. 72-90. 
406. — Cros, A. Hornia nymphoides 
Escal. Bui. soc. hist. nat. Alger 11 
1920 p. 76. [ Coleoptera .] 
407. — Cros, A. Contribution a 
l’etude des Rhipiphorides Algeriens. 
Macrosiagon tricuspidata Lepechin. 
Bull. soc. hist. nat. Alger 11 1920 
pp. 56-68 70-75. [Coleoptera.] 
408. — Cros, A. Meloe foveolatus 
Guerin. (Note rectificative*.) Bull, 
soc. hist. nat. Alger 11 1920 p. 75. 
[Coleoptera.] 
409. — Cros, A. Contribution a 
i’etude des Rhipiphorides algeriens 
(addenda et corrigenda). Bull. soc. 
nat. hist. Alger 12 1921 pp. 19-20. 
[Coleoptera . } 
410. — Cunliffe, M. Preliminary ob- 
servations on the habits of Oscinella 
frit Linn. Ann. appl. Biol. Cambridge 
8 1921 pp. 105-133. [Diptera.] 
411. — Cunningham, G. H. The genus 
Cordyceps in New Zealand. With 
special entomological notes on the 
hosts, by J. G. Myers. Tr. New Zealand 
Inst. Wellington 53 1921 pp. 372-382 
pis. lix.-lxii. 
412. — Curran, C. H. A revision of 
Syrphus species belonging to the 
ribesii group. Canad. Entom. Guelph 
53 1921 pp. 152-159. [Diptera.] 
413. — Curran, 0. H. New species of 
Syrphidae. Canad. Entom. Guelph 53 
1921 pp. 171-176. [Diptera.] 
414. — Cushman, E. A. North Ameri- 
can Ichneumon-flies of the genera 
Clistopyga and Schizopyga. Proc. U.S. 
Nat. Mus. Washington 60 No. 2399 
1921 pp. 1-14. [Hymenoptera.] 
415. — Cushman, R. A. The males of 
the ichneumonid genera Myersia and 
Thaumatotypidea, with descriptions of 
neAv species. Proc. ent. Soc. Washington 
23 1921 pp. 109-112. [Hymenoptera.] 
416. — Cushman, R. A. and Gahan, 
A. B. The Thomas Say species of 
Ichneumonidae. Proc. ent. Soc. 
AVashington 23 1921 pp. 153-171. 
[Hymenoptera.] 
417. — CziSek, K. Dio mahrischen 
Formen der DiptereniaxmWe Liriopidae 
(Ptychopteridae). Cas. Mor. Mus. 
Zemsk. Briinn. (Zeitschrift des Mahris- 
chen Landesmuseums) 17 1919 pp. 1-16 
10 figs. 
418. — Dadd, E. Hydriomena coeru- 
leata F. ( =autumnalis Strom, trifas- 
cia la Hb. nec Schiff) und ihre Formen. 
D. ent. Zs. Berlfn 1921 pp. 92-94. 
[Lepidopiera.] 
419. — Dadd, E. Mesoleuca alhicillata 
f. n. vestata. D. ent. Zs. Berlin 1921 
p. 94. [Lepidoptera.] 
420. — Dahl, F. Die Trutzfarbenlehre.. 
Zool. Anz. Leipzig 53 1921 pp. 266-273. 
421. — Davidson, J. Biological studies 
of Aphis rumicis Linn. 1746. Ann. 
appl. Biol. Cambridge 8 1921 pp. 51-63. 
[Homoptera.] 
422. — Davidson, J. Biological studies 
of Aphis rumicis L. A. Appearance of 
Winged Forms. B. Appearance of 
Sexual Forms. Sci. Proc. R. Dublin 
Soc. 16 (N.S.) 1921 pp. 304-322. 
[Homoptera.] 
423. — Davidson, J. Biological studies 
of Aphis rumicis Linn. Bull. ent. Res. 
London 12 1921 pp. 81-89. [Homo- 
ptera.] 
424. — Davidson, W. M. Observations 
on Psyllohora taedata Le Conte, a 
coccinellid attacking mildews. Ent. 
News Philadelphia 32 1921 pp. 83-89. 
[Coleoptera.] 
425. — Davis, J. J. Contributions to 
a knowledge of the natural enemies of 
Phyllophaga. Bull. Illinois Survey 13 
Art. V. 1919 pp. 53-138 pis. iii-xv figs. 
1-46. [Coleoptera.] 
426. — Davis, W. T. Records of 
Cicadas from N. America with descrip- 
tions of new species. J. New York 
Ent. Soc. 29 1921 pp. 1-15 pis. i & ii 
figs. [Hemiptera.] 
