OF WASHINGTON, VOLUME XVII, 1915 173 



Described from three specimens. 



The writer is indebted to Messrs. F. Knab and N. Banks for 

 advice regarding the specimens used in the preparation of this 

 paper 



NOTE 



Since the manuscript of this article was submitted for printing 

 an important paper by Dr. J. M. Aldrich has appeared: The Deer 

 Bot-Flies (genus Cephenomyia Latr.), J. N. Y. Ent. Soc. XXIII, 

 pp. 145-150, 1 pi. Dr. Aldrich describes a new species under the 

 name abdominalis. This species, however, is quite distinct from 

 pratti in the striking difference in the color of the abdominal pile 

 and in the dark anterior wing margins, which Dr. Aldrich informs 

 the writer are even darker than this illustration shows, in fact 

 quite blackish from the anterior cross vein forward. 



SOME MODIFICATIONS OF THE HYPOPHARYNX IN 

 LEPIDOPTEROUS LARV^. 1 



BY J. J. DEGRYSE. 

 Branch of Forest Insects, U. S. Bureau of Entomology. 



In his morphological study on the mouthparts of Crustaceans 

 and Insects, 2 published in 1893, H. J. Hansen contends that the 

 paired appendages existing on the sides of the hypopharynx 



1 Since writing this paper I had the opportunity of again examining 

 Lyonet's Traite anatomique de la Chenille qui ronge le bois de Saule 

 (The Hague, 1762). His figures of the labium and hypopharynx are most 

 interesting especially from the standpoint of the internal anatomy of the 

 lower lip. He refers to the so-called maxillula? as "Rebords de la Levre 

 inferieurc." In Chap. IV, p. 62, he gives his theory of the function of these 

 organs. In spite of the imperfection of his instruments, Lyonet's dissec- 

 tions are remarkably accurate. The shape of the chitinous blades or spines 

 was no doubt beyond the power of his microscope. As to the arrangement 

 of the muscles, I think there is a slight ('(infusion in the drawing (Lyonet, 

 PI. XVII, fig. 25), though in the text (Chap. XVII page f><>:!, the author 

 supposes the existence of other muscles, besides those figured in PI. XVII, 

 by so doing he partly solves our difficulty. I have not studied the particu- 

 lar species described by the master, but from a. comparison with other lepi- 

 dopterous larva', it is probable that his muscle 7 should consist of two 

 different muscles /' and 7". 7' is attached dorsally to the mental arm and 

 ventrally to the threadprcss on the salvary glands. 7" is attached dor- 

 sally to the same press and ventrally to the mentum. l-'.ach of thc.-c 



muscles is provided with a separate embrdnch nt <" and C" of the trachea 



indicated by the letter C in Lyonet's drawing. (See pi. 10, fig. 7). 



- "Zur Morphologic der ( l!iedm;issen und Mundthcile bei < 'rustaceen 

 und Insckten." Zool. An*. XVI, 1893, pp. 193-8 and 201-212. 



