82 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



3. Aiiti'iior tarsi not chelate 4 



Autcrior taisi t-liclate. 



Protliorax alumst a.s long as the mesoiiotuni ; fourth joint of antorit>r tarsi much 

 lou,i;cr than tho third, the tirst joint not, or scarcely, louj>('r than 

 the three following united; maxillary palpi 5-jointed. 



ClIELO(iYNCS Hal. 

 Prothorax much shorter than the mesonotnm; fourth joint of anterior tarsi 

 scarcely longer than the third, the lirst not, or scarcely, longer than 

 the three following united; maxillary palpi 4-jointed. 



Anteon Juriue. 



4. Prothorax much longer than the mesonotum, the latter without a trace of a fur- 



row ; head large, broad M ystrophorus Forster. 



Prothorax above not or only slightly visible ; mesonotum strongly developed, with 

 furrows Aphelopus Ualm. 



MALES. 



1. Stigma oval or ovate 2 



Stigma lanceolate. 



Occiput deei)lj' concave; vertex and neck separated by a sharp angle; mesono- 

 tum with distinct furrows; a discoidal cell; maxillary palpi 4- 

 j ointed Labe( ) Hal. 



Occiput not concave, straight and broad; mesonotum without furrows; no dis- 

 coidal cell; maxillary palpi 5-joiuted Puokhas Ashni. gen. uov. 



2. Prothorax nmcli longer than the mesonotum. 



Mesonotum with furrows; maxillary palpi 5-jointed Chelogynus Hal. 



Mesonotum without furrows; maxillary paljii 4-joiuted..MYSTROPUORUS Forst. 

 Prothorax nuich shorter than the mesonotum. 

 Mesonotum with or w*ithout traces of furrows; maxillary palpi 4-joiuted. 



Anteon J urine. 

 Prothorax not, or scarcely, visible from above. 

 Mesonotum strongly developed, with furrows; maxillary palpi 5-jointed. 



Aphelopus Dalm. 



GONATOPUS Ljungh. 

 Web. und Mohr. Beitr., 1810, p. IGl ; 1 )icondylus Hal., Ent. Mag., iv, p. 410 ( 1837). 

 (Type G. pedestrh Dalm.) 



Head large, transverse; wlieu viewed froui in front very short, trian- 

 ii'ular, the vertex deeply impressed and sloping off towards the neck; 

 the occiput convex, not margined; eyes very large, i^rominent, occupy- 

 ing the whole side of the head; ocelli small. 



Antenna? 10-jointed, filiform or subclavate; scape about one-third 

 the length of the head, thicker but not much longer than the second. 



Maxillary palpi 5-jointed. 



Mandibles 3-dentate, the outer tooth long and acute. 



Thorax greatly elongated and of a peculiar shape; the prothorax 

 much wider than the mesothorax, the latter elongate and humped at 

 the middle, ami separated from the metathorax by a strong constric- 

 tion ; the metathorax clavate. 



Wings always absent. 



Abdomen oblong-ovate, subi)etiolate, the second segment the longest. 



Legs very long, the posterior pair greatly lengthened ; coxa' large, 



