ADDITIONS AND CORRECTIONS. 261 



I 



inverted-turbinate ; pubescence of antennae short, without any longer 

 hairs. 



Eyes contiguous in front of the ocelli, slightly diverging lower down, 

 and leaving room for a narrow, triangular front between them. A deep 

 groove divides each eye in two halves ; the upper portion, having the 

 larger facets, is a little longer than the lower portion. A strip destitute 

 of facets is not perceptible in that groove. 



Legs rather strong, especially the hind femora ; front coxse at a con- 

 siderable distance from each other ; those of the middle pair are more 

 approximate, those of the hind pair are contiguous ; hind tibia? with a 

 pair of distinct spurs, the inner one by far the longest ; spurs on middle 

 tibia? very minute ; I do not see any on the front pair ; hiud tarsi equal 

 in length to or | of the hind tibiae. 



Wings like those of the other Blepharoceridse as to shape, secondary 

 venation, and chitiuous iucrassatiou in the axillary excisiou. Submar- 

 ginal cell short, provided with a petiole about equal in length to the 

 abbreviated vein of the posterior margin. A crossvein connects the 

 second vein with the fourth ; another crossvein connects the fourth with 

 the base of the large fork of the fifth vein. (In other words, the venation 

 is like that of Liponeura yosemite; also like that figured in Loew, Revision, 

 etc., fig. 5, with the exception, as to the latter, of the structure of the 

 submarginal cell, as stated above.) 



The ovipositor consists of two short, rather obtuse larnels. 



IV, p. 92, Comastes. The genus Heterosti/htm, Macq., 3d Suppl., p. 

 35, is the same as Comastes. The principal character, assigned to it by 

 Macquart, pubescence of the third anteuual joint, has no existence in 

 reality ; Macquart mistook dust for a pubescence ! I saw the original 

 type in Mr. Bigot's collection. I do not think that under such circum- 

 stances the older name has any claim to priority, especially in this case, 

 where that name is derived from the very character whose existence is 

 disproved. 



V, p. 134, below Helophilus polygrammus, Loew, is a 

 synonym of H. mexicanus, Macq. I saw many Mexican specimens in Mr. 

 Bigot's collection. 



VI, p. 181, line 16 from bottom. Strike out the (?) before Oxycephala 

 maculipen.iis ; I saw Macquart's type in Mr. Bigot's collection. 



