DASCYLLIDAK. 169 



great part concealing; e lalinun and niaiidihles in r('pos(\ Pro- 

 sternum moderately separating the eoxaj, usually nioeting the 

 mesosternuni, tiie anterior coxai oval, not more prominent than 

 the prosternum and with large troehantin. Mesosternuni sepa- 

 rating the coxffi, horizontal or oblique (Allopogo)i). Metasternal 

 epimera concealed. Posterior coxa? very narrow, with narrow 

 plates, feebly dilated within, slightly separated at middle. Tro- 

 chanters of anterior and middle legs moderately long. Fourth 

 tarsal joint with two long narrow lobes, ungues simple. Ony- 

 chium wanting. 



This tribe differs from the Dascyllini which follow by the 

 slightly prolonged epistoma concealing the labrum and mandi- 

 bles, and by the slightly separated posterior coxa;. 



The genera which occur in our fauna are as follows: — 



Prosternum pi-olouged, meeting the mesosternum and limited on each side 



in front by an elevated line divergent anteriorly. 



Antennre slender, elongate, joints 2-3-4 very short, togetlicr not longer 



than the fifth. Macropogon. 



Antennse subserrate, joints 2-3 only short, togetlicr (Mjual to tlie 



fourth. Eurypogon. 



Prosternum not prolonged nor meeting the mesosternum, in front convex 



without raised lines. 



Antennffi serrate, second joint short, third a little longer and but little 



shorter than the fourth. Allopogon. 



The genera of this tribe seem to have a certain relationship 

 with the Eucnemina3 through Cerophi/luni. 



Tribe II.— »ASC¥LLI1VI. 



The clypcal suture is sometimes visible, and sometimes behind 

 the labrum may be seen a membranous epistoma. The proster- 

 num does not articulate with the mesosternum; the plates of the 

 hind coxiXi are gradually dilated internally; the onyeliium is 

 small, bisetose, and sometimes wanting. Trochanters of ante- 

 rior and middle legs normal in size, not elongate. 



The posterior coxaj are contiguous in Vascyllus, yl??or«.s', and 

 AraeopuH, distinctly separated in Anchytamus, and merely slightly 

 contiguous in the others. 



In geograi)hical distribution Odontonyx and Anrhyfarsus are 

 each represented by one species in the Atlantic region; the other 

 genera are peculiar to the Pacific fauna, and have one species 

 each, excepting Dascyllm^ with two. 



