586 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



1906. Berlese, a., Gli Insetti, loro organazzizione sviluppo, abitudini e rapporti 



coll'uouio. — Published by the Societa Editrice Libraria, Milan, 1906. 



1907. Hewett. C. a.. The structure, development, and bionomics of the house 



fly.— Quart. Journ, Micr. Sci., LI, 1907, pp. 395-448, pis. xxii-xxv. 



1907. Holmgren. N.. Zur Morphologie des Insektenkopfes. III. Das " Endo- 



labialmetamer " der Phalocrocera-Ijnrve. — Zool. Anz„ XXXII, 1907, 

 pp. 73-97. 9 figs. 



1908. CrxVmpton, G. C, Ein Reitrag zur Homologie der Tliorakal-Sclerite der 



Insekten. — Inaug. Diss., Berlin, 1908. 

 1908. Desguin, E., La composition segmentaire du thorax des insectes. — Ann. 

 de la Soc. Ento. de Belgique. LI I (3), 1908, pp. 113-126, pis. i. ii. 



1908. Snodgrass. R. E., A comparative study of the thorax in Orthoptera. Eu- 



plexoi)tera, and Coleoptera. — Proc. Eut. Soc. Washington, IX, 1908. pp. 

 95-108, pis. ii-v. 



1909. Crampton, G. C, A contribution to the comparative morphologie of the 



thoracic sclerites of insects. — Proc. Acad. Nat. Sci. Philad., 1909, pp. 

 3-54, pis. i-iii, 21 text figs. 

 1909. Snodgrass, R. B., The thoracic tergum of insects. — Ent. News, March, 1909, 

 pp. 97-104, pi. VI. 



X. EXPLANATION OF THE PLATES. 

 (Drawings by the writer.) 



Abbreviations. 



A. anal vein or veins. 



AF, anal fold of the wing. 



A1, alula. 



AN I', anterior notal wing process. 



ANR, anterior notal ridge. 



anr, line on surface of notum formed by ANR. 



Ap, apodeme. 



Aph, anterior phragma or prephragma in each segment. 



Au, auditory organ of locust. 



lAx, 2Ax, 3Ax, J,Ax (also 1, 2, 3, .)), the first, second, third, and fourth axillaries 

 or articular sclerites of the wing base. On plates 64-69 the first and fourth 

 indicated by transverse shading, the second by oblique, the third, by longi- 

 tudinal. 



AxC, axillary cord. 



AxM, axillary membrane. 



■C, costa or first vein of wing. 



Cr, cercus, appendage of tenth abdominal segment. 



Cm, cubitus, or fifth vein of wing. 



Cx. coxa. 



Cxa, accessory sclerite at base of coxa. 



CxC, coxal cavity. 



CxP, coxal process. 



D, vena dividens. 



El, elytrum. 



Em, lateral emargination of notum. 



Epni. epimerum. 



cpin, subdivision of epimerum. 



Eps, episternum. 



cps, subdivision of episternum. 



F, femur. 



