BYRRHID^: 37 



circle; each is attached in a minute and scar-like, feebly asperate 

 punctule; abdomen micro-reticulate but not distinctly punctate, 

 with some scattered hairs; metasternum short, with some rather 

 coarse, moderately close punctures; its anterior margin, along the 

 mesosternal pit, elevated and cariniform. Length 1.5-1.6 mm.; 

 width 0.9-1.0 mm. British Columbia (Metlakatla), Keen. [. 

 plenralis Csy., Can. Ent., 1908, p. 282] pleuralis Csy. 



In my original description the language "free though retractile," 

 in referring to the legs, is intended to mean that the anterior legs 

 when retracted are not deeply sheltered as they are in the preceding 

 tribe and especially in Curimus, Syncalypta and many other types, 

 being in fact more like those of Simplocaria. 



Subfamily LIMNICHIISLE. 



The radically different method of protecting the antennae in 

 repose is an ample reason for treating the numerous very small 

 species of the Limnichus group as a subfamily, instead of a simple 

 tribe; but there are other important reasons also, such as the 

 different habits and the generally distinct epistoma or clypeus. 

 There are two tribal groups included within the scope of the defini- 

 tion previously given for the Limnichinae, which may be defined as 

 follows : 



Pronotum without cavities for the antennae in repose; antennae with the 

 funicle comprising joints three to six or eight very slender and cylin- 

 dric LIMNICHINI 



Pronotum with polished sublateral cavities for the shelter of the distal 

 parts of the antennae in repose; antennae stout basally, thence gradu- 

 ally tapering to the neighborhood of the club; body very minute. 



BOTHRIOPHORINI 



The second of these two tribes consists at present of but few 

 species, while the first includes numerous species as well as many 

 genera. Both tribes are native to the palaearctic and nearctic 

 faunas and the Limnichini extend at least as far to the southward 



as Panama. 



Tribe LIMNICHINI. 



The numerous genera of this tribe, which is more developed and 

 diversified in the new than in the old world, may be differentiated 

 readily as follows: 



Antennae not partially sheltered in repose within posterior cephalic de- 

 pressions, but usually placed in close contact with the sides and base, 

 sometimes apparently free; pubescence forming a single system; 

 epistomal suture very fine and feeble to obsolete, never groove-like. . 2 



