1865.] 227 



I. Toxorhina, Cylindrotoma, Triogma and Phalacrocera. 



The fragment of my manuscript above alluded to and which escaped 

 destruction, begins with the Toxorhina, the last ejenus anion"' the him- 

 nobina rhamphidiseformia and comprises the whole of the Limtwbina 

 cylindrotomse.formia. It is given here without any change, except the 

 omission of the references to the figures of the wings, which were to 

 illustrate the descriptions. 



Gen. VIII. TOXORHINA. 

 Characters. — One marginal cell ; no submarginal, a discal, and four posterior 

 cells; no stigmatical cross-vein. Proboscis very long, longer than head and thorax 

 taken together ; palpi exceedingly minute, inserted at its tip. Antennae very 

 short, 12-jointed ; basal joint of the flagellum very stout; the two apical joints 

 only are provided with several long bristles. Thorax elongated, extended ante- 

 riorly into a long, cylindrical neck; mesonotum strongly projecting over the 

 collare; metanotum long, horizontal. Tibise without spurs at the tip. Empo- 

 dia indistinct or none. 



The head is proportionally very small. 



The antennae are 12-jointed, hardly longer than the head ; the first 

 joint is very short, and still shorter in the male than in the female ; 

 the second is longer and much stouter than the first, obconical ; the 

 third is incrassated, although less stout than the second joint; it seems 

 to represent the coalescence of several joints ; it is more or less rounded 

 in the male, and more elongated, almost conical in the female; the re- 

 mainder of the antenna is filiform ; the two apical joints in the male 

 are elongated, slender, and considerably longer than the preceding 

 joints, a difference which is not so striking in the female; the intermedi- 

 ate joints are cylindrical, those nearer to the stout basal joint of the 

 flagellum are sometimes very short and broader than long; the two 

 joints of the scapus bear some short bristles ; the pubescence of the 

 flagellum is almost imperceptible ; the two apical joints only bear some 

 long bristles, very characteristic for the genus. 



The front is narrow in T. magna and broader in T. tnulibris ; the 

 eyes are slightly emarginate on the inside, to leave room for the inser- 

 tion of the antenna} and very closely approximated, almost contiguous, 

 on the underside of the head. 



The palpi, inserted at the tip of the proboscis, are exceedingly minute 

 and their joints seem to be almost coalescent; (compare, as to the struc- 

 ture of the palpi of this genus, Mr. Loew's figures, Linn. Entom. V. 

 Tab. II, f. 19, 20, 21.) 



The proboscis is slender, perfectly linear, with an almost impercep- 

 tible pubescence; both species described below have it about once and 

 a half the length of the head and thorax taken together. 



