474 ENTOMOLOGICAL NEWS. [Dec., 'l6 



serial H. XXIV. On the genus Nitela, 11, xviii, 343-46. Urbahns, 

 T. D. Life history of Habrocytus medicaginis, a recently described 

 parasite of the Chalcis fly in alfalfa seed, 447, vii, 147-54. 



Cockerell, T. D. A. Bees from the northern peninsula of Michi- 

 gan [1 new], 507, No. 23, 10 pp. (See under General.) Crawford, 

 J. C. Nine n. sps. of H. [8 new], 420, iv, 101-7. Girault, A. A 

 The occurrence of the genus Achrysocharelloidea in No. Am.; 

 Descriptions and observations on some chalcidoid H. [8 new], 4, 

 1916, 336; 337-44. Descriptions of miscellaneous No. Am. Chalci- 

 doid H. of the family Eulophidae [3 n. gen.; 23 n. sps.]; New N. 

 Am. H. of the family Eulophilidae [2 n. gen.; 11 n. sps.], 50, li, 

 39-52; 125-33. New miscellaneous chalcidoid H. with notes' on 

 described species [2 n. gen.; 12 n. sps.], 180, ix, 291-308. Three new 

 chalcid flies from California, 189, viii, 119-22. A new miscogasterid 

 chalcid fiy from Maryland; Pirene marylandensis n. sp., 411, xi, 

 87-8; 88. Sladen, F. W. L. (See above). 



CHECK LIST OF THE HEMIPTERA (EXCEPTING THE APHIDIDAE, AI.EURODI- 

 DAE AND COCCIDAE) OF AMERICA, NORTH OF MEXICO, by EDWARD P. 

 VAN DUZEE. New York Entomological Society. Price, $1.50. 



In this work just published, Mr. E. P. Van Duzee puts all Ameri- 

 can hemipterists under a heavy burden of gratitude. He brings 

 together and presents in orderly fashion the data which have accumu- 

 lated in the last thirty years in this branch of entomology. None can 

 adequately realize the debt we owe Mr. Van Duzee better than those 

 who have themselves attempted the enormous labor of correlation of 

 the scattered fragments that constitute entomological literature. 



In this new Check List, Mr. Van Duzee has given American hemipter- 

 ists an adequate point of departure for classifying and arranging their 

 collections. Nothing similar and covering the whole ground in 

 Hemiptera has been attempted since Uhler's Check List appeared thirty 

 years ago. State and local lists have been published ; a Catalogue saw 

 the light of clay, but Uhler, up to this time, has remained the sole com- 

 prehensive and orderly arrangement of the North American Heter- 

 optera. Van Duzee has gone beyond his predecessors and has con- 

 sidered the Homoptera as well, except as indicated. 



Did Science stand still, it would either perish of stagnation, or on 

 the instant begin a retrograde motion. Hence it is that this work is 

 obsolescent from the moment the last entry was made just before it 

 went into the printer's hands. Current specialists' monographs modify 

 certain of the data. 



The principles guiding Mr. Van Duzee in his work are set forth in 

 the Preface, and this Check List must be used and judged in their 

 light. In nomenclature there is much room for dissent, and especially 



