290 C. R. Osten Sacken: 



two front pairs are comparatively weak, the hind pair on the contrary, 

 very streng , with stouth femora , providcd with rows of spines on the 

 undcrside, the hind tibiae often have a streng hook at the end; all 

 these characters are foreign to the Asilidae, as well as to Apiocera.) 



The Vertex of Apiocera is but little excavated between the eyes 

 and the existing excavation is nearly filled out by a broad, flat and 

 but little marked ocellar tubercle, scparated from the eyes by a deep 

 furrow on each side; the ocelli are rather large, far apart, especially 

 the anterior one, which is not od the tubercle, but a little in front 

 of it. (In the Asilidae, the ocelli are closer together, on a well-marked 

 tubercle, placed at the bottom of a more or less deep excavation of 

 the Vertex. The Midaidae have no ocelli; except the genus Rhaphio- 

 midas 0. S., which as will be shown below, is probably an Asilid.) 



The face is so short, that the antennae are inserted immediately 

 over the oral opening and almost touch the palpi; there is no room 

 for the mystax, so characteristic among many Asilidae. 



The palpi consist of a long subcylindrical basal Joint, and of a 

 large spatulate pubescent second Joint; I do not know of auy similar 

 structure among the Asilidae. The Midaidae have no palpi at all, or 

 they must be rudimentary, and the rudiments * have not been disco- 

 vered yet. 



The scapus of the antennae is beset with conspicuous bristles, 

 and, in that respect, resembles that of many Asilidae; the oval third 

 Joint, with a short, stout, pointed style, is unlike that of the Asilina, 

 but similar structures occur among the Dasypogonina. 



The proboscis (more or less long in different species) has narrow, 

 but distinct fleshy lips at the tip. 



The prothorax is much less developed than in the Asilidae, and 

 hence, the head is more approximate to the thorax; the latter, on the 

 contrary, is more developed in front of the wings than in the Asilina; 

 the mesonotum is more flat than in Proctacanthus or Erax, The scu- 

 tellum is like that of the Asilidae, strongly projecting, and concealing 

 Ihe narrow metanotum. (In the Midaidae the scutellum is very different, 

 a narrow parallelogram , not projecting and not overshadowing the 

 metanotum at all.) 



The abdomen does not differ much from that of Proctacan- 

 thus or Erax, except that it is a little broader and flatter at the 

 base. The forceps ($) is very like that of those two genera in its 

 outward appearance, and very different from the hidden forceps of most 

 Midaidae. The $ has at the end of the abdomen a Coronet of spines 

 like Proctacanthus, and several other Asilidae, Midaidae, Therevidae. 



The coloring of the body, the gray lines on dark ground of 

 the thorax, the white and gray spots of the abdomen, resemble those 



