tVXOPSIS OF SEOTROPICAL LIUXOBIN^T^—M^EXANDER. 485 



3. Thoracic sclerites: 

 Crampton, G. C. 



A Contribution to the Comparative Morphology of the Thoracic Sclerites of Insects. 



Proc. Acad. Nat. Sci. Philadelphia, Jan., 1909 (Feb. 22, 1909), pp. 3-54, pis. 1-4. 



Snodgrass, R. E. 



The Thorax of Insects and the Articulation of the Wings. 



Proc. U. S. Nat. Mus., vol. 36, pp. 511-595, pis. 40-<59 (Noa. 1687, 1909). 



4. Abdominal sclerites: 



CoMSTocK, J. H., and Keixogg, V. L. 

 The Elements of Insect Anatomy. 

 Ithaca. N. Y., 1904. 



5. Hypopiigial characters: 

 Snodgr.\ss, R. E. 



The H\-popygiuin of the Tipidida;. 



Trans. Amer. Ent. See., vol. 30, pp. 179-230, pis. 8-18. 



The above are, without much question, the best and are recom- 

 mended to students of the family as standards to be followed in the 

 describing of species. 



TMierever I have asked for specimens, available material was veiy 

 cheerfully given me for study. I wish to express my sincere grati- 

 tude to several gentlemen for tlieir kindness in regard to this matter. 

 These are Mr. Frederick Knab, of the United vStates Xiitional Jhiseum ; 

 Mr. J. A. Grossbeck, esjjecially ivr tlie loan of the Lutz-Crampton 

 Guiana collection; Mr. S. H. Henshavv of the Museum of Comparative 

 Zoology; Prof. C. F. Baker, Mr. C. W. Johnson, Mr. E. T. Cresson, jr., 

 and others. Much of tlie work was done as research ui the Systematic 

 Entomological Laboratory of Cornell, under the direction of Dr. J. 

 Chester Bradley, and to Doctor Bradley and Doctor Neeilham, my 

 sincere thanks are due for contbiual help. 



Tlie following collections are embraced in the material studied: 



1. United States National Museum, Washington, District of 

 Columbia. A very extensive series of nearly 400 specimens re|>- 

 resenthig about 90 species: received tlirough Mr. Knab. 



2. American Museum of Natural History, New York City. A 

 collection embracing about 50 specmiens in 37 species; received 

 tlirough Mr. Grossbeck. 



3. Museum of Comparative Zoology, Cambridge, Massachusetts. 

 A collection of six specimens, four species, but of especial interest as 

 belonguig to theOsten Sacken and Loew collections; received throu<i-h 

 Mr. S. H. Ilenshaw. 



4. Boston Society of Natural History, Boston, Massachusetts. 

 A specimen of Tanypremna; received tlirougli Mr. C. W. Johnson. 



o. Academy of Natural Sciences. Philadelphia, Pennsylvania. A 

 collection of about 2.5 specimens, 5 or G species; received through Jlr. 

 Cresson. 



