82 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



3. Anterior tarsi not chelate 4 



Anterior tarsi fliclate. 



Protborax almost as lonj; as the mesont>tuui ; fourth joint <»f anterior tarsi much 

 louj^er than the third, the lirst joint not, or scarcely, longer than 

 the three following united; maxillary palpi 5-jointed. 



ClIKLOUYNUS Hal. 

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

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

 the three following unite»l; maxillary palj . 4-jointed. 



Antkon J urine. 



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



row ; head large, broad M ysti{< H'IIORUS Forster. 



Prothorax above not or only slightly A'isible ; mesonotum stnnigly developed, with 

 furrows Aphelox'US Dalm. 



MALKS. 



1. Sfcigma oval or ovate 2 



Stigma lanceolate. 



Occiput deeply concave; vertex and neck separated by a sharp angle; nu;sono- 

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

 j(»inted Laheo Hal. 



Occiput not concave, straight aiul broad; mesouotum without furrows; no dis- 

 eoidal cell; maxillary palpi 5-jointed Piiokijas Ashm. gen. nov. 



2. Prothorax mu<'h longer than the mesonotum. 



Mesonotum with furrows; maxillary palpi 5-joiiited Ciielogynis Hal. 



Mesonotum without furrows; maxillary pali)i 4-joiuted..MYSTKOiMioiJi;s Forst. 

 Prothorax much shorter than the nu'sonotum. 

 Mesouotum with or without 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. 



Aphelopiis 1 )alm. 



GONATOPUS Ljiiiigh. 

 Web. und Mohr. Beitr., 1810, p. 161; Dicoudylus Hal., Ent. Mag., iv, p. 410 (1837). 



(Type (/. pedeHtr'iH Dalm.) 



Head large, transverse; when viewed from in front very short, trian- 

 gular, the vertex deeply impressed and sloping oft" towards the neek; 

 the occiput convex, not margined; eyes very large, prominent, occupy- 

 ing the whole side of the head; ocelli small. 



AntenniX? 10 jointed, liliform or sidxlavate; scaj)e alxmt one-third 

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



Maxillary palpi 5-jointed. 



Mandihles Sdentate, the outer tooth long and acute. 



Thorax greatly eh>ngated and of a peculiar shape; the prothorax 

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

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

 tion; the metati'orax clavate. 



Wings always absent. 



Abdomen oblong ovate, subpetiolate, the second segment the longest. 



Legs very long, the posterior pair greatly lengthened ; coxie large, 



