APHCEBANTUS. 



145 



this group. Although I have devoted a great deal of time to the working-out of the 

 small material at my command, I am far from satisfied with the result, and only hope 

 that it may facilitate and not impede the work of others. I am greatly indebted to 

 Dr. Williston, of New Haven, U. S., for the communication of specimens. Several of the 

 species described below were only found outside of the geographical limits of the 

 ' Biologia Centrali- Americana ' ; it would have been inexpedient to omit these in a first 

 attempt at a monographic treatment of this group ; and, moreover, they all belong to 

 the same zoological region, and will very likely be discovered south of the Mexican 

 border. The species not yet detected in our region are placed in brackets. 



Synopsis of the Species. 



Scutellum hairy, but without any bristles that are distinctly 

 longer and stronger than the rest. 

 Third antennal joint conical, prolonged in a style about 

 as long as the cone ; first abdominal segment, poste- 

 riorly, with a conspicuous fringe of white tomentum ; 

 legs black, the knees reddish, pubescent ; the 



spinules on the tibiae small and weak 1. A. cyclops, sp.n., J $ . 



Third antennal joint elongate- conical, with a minute joint 



ending in a bristle at the tip [2. A. rattus, sp. n., $ $ .] 



Third antennal joint subglobular or onion- shaped (unsym- 

 metrical), prolonged in a style at least one and a half 

 times as long as its basal portion ; first abdominal 

 segment, posteriorly, with a fringe of yellowish hairs 

 less conspicuous than the fringes on the following seg- 

 ments ; femora black, the knees and tibiae reddish- 

 brown, the ground-colour almost concealed under 

 a covering of silvery scales ; the spinules on the 



tibiae longer than in A. cyclops . 



Scutellum (generally also the prae- and post-alar callosities) with 

 more or less distinct bristles or stronger hairs. 

 The hind femora, on the outer, lower side, showing a series 

 of a few spinules, which are distinctly stronger than 

 ordinary hairs. 

 Abdomen black, the hind margins of the segments with 

 a more or less distinct white tomentum . . . 

 Abdomen clothed with a more or less dense yellowish- 

 brown tomentum. 



Front beset with black, erect hairs 



Front beset with whitish, erect hairs .... 



Abdomen white at the base, with alternating ochreous 



and white cross-bands, formed by the tomentum 



on the following segments 



BIQI* cente.-amer., Dipt., January 1887. 



"^ 4v ££**'> »a. 



[3. A.,vp.7] 



4. A. (Triodites) mus, O. S., <J ? . 



[5. A. cervinus, Loew, ? .] 

 [6. A. conurus, sp. n., <£ .] 



7. A. bisulcus, sp. n., ? . 

 u 



