Vol. XXvi] ENTOMOLOGICAL NEWS. 305 



EXPLANATION OF PLATE XL 



All the figures are of Thaumatoneura larvae or of parts thereof. 



Figs, i to 3 are from photographs by Mr. H. A. Walters, of alcoholic 

 specimens. 



Fig. I, larva No. 8, 9- , dorsal view. x 2. 



Figs. 2, 3, larva No. 4, $ , dorsal and ventral views respectively 

 x 1.8. The median caudal gill is detached and lying on its side. 



Figs. 4 to 9 are from camera drawings made with a binocular stereo- 

 scopic, or a compound, microscope; figs. 4 to 6 and 8 are from larva 

 No._ 4 , $. 



Figs. 4, 5, ventral views of the right and left mandibles respectively 

 of larva No. 4, $ . d, b, c, v, the apical teeth, d the most dorsal, v the 

 most ventral ; d 1 the most dorsal, v 1 the most ventral, spine of the inner 

 process of the left mandible; abt, adt, tendons of the abductor and 

 adductor muscles respectively. x 12. 



Fig. 41, curved inner process of the right mandible viewed from the 

 base of the mandible to show the minute ante-apical denticle. 



Fig. 5, outline of the end view, or mesal surface, of the inner process 

 of the left mandible. 



Fig. 6. Labium, dorsal surface, abl abductor, adl adductor of the 

 lateral lobe ; Urn flexor of the mentum, fit flexor of the terminal or 

 movable hook. x 5. 



Fig. 7. External view of left lateral gill of larva No. 5, $, drawn in 

 situ on the larva. x 5. 



Fig. 8. Right half of the distal margin of the median labial lobe, t* 

 tooth. x 53. 



Fig. 9. Left profile view of the median caudal gill of larva No. 6; 

 gd a small piece of the dorsal edge of proximal joint of the same gill; 

 gv a small piece of the ventral edge of pioximal joint of the same 

 gill. Fig. 9, x 5, gd and gv, x 30. 



> . 



Note on the Bombyliid Genus Rhabdopselaphus Rondani 



(Pseudogeron Cress.) (Dip.). 



In a previous issue of this Journal* I published a paper on a supposed 

 new genus (Pseudogeron') of this family allied to Gcron. Since then 

 Prof. Aldrich has called my attention to the possible synonymy of my 

 genus with Rhabdopselaphus Rond., (Bui. Soc. Ent. France, 1886, p. 

 ciii), based on Dr. Williston's note on page 389 of his Manual (third 

 edition). I regret that I had not studied the Manual more thoroughly, 

 for 1 was naturally led astray by Rondani's mention of three sub- 

 marginal cells in his generic description."^ Dr. Williston, who has ex- 

 amined the type of Rhabdopselaphus, notes that it has only two sub- 

 marginals. This fact, with the form of the antennae and palpi, seems 

 to be sufficient proof of the synonymy. My name for the .yenus must 

 therefore be replaced by Rhabdopselaphus Rondani with R. nuts Rond. 

 =Gcrnn ca[>ax Coq. as the type species. It is quite evident from the 

 description that R. inns is synonymous with Gcron capux Coq. This 

 genus is closely allied with Oliinnlrnncs L\v. (1844) and Analysis Lw. 

 (1860). From the former it differs in the form of the palpi which here 

 have the terminal joint very long, this being the only one visible; also 

 in the slightly different third antennal joint. From the latter it differs 

 in the presence of the complete discal cell. F. T. CRI'SSOX, JR., Acad- 

 emy of Natural Sciences of Philadelphia. 



*Ante page 200. 



