Humaluta.] STAniYLiNiDji. 



67 



It is found in the galleries of Hi/lur£fus, &c. ; the pupa is exactly like that of 

 PJiloeopora. 



The \ay\vo iind \m\yx of the smaller Aleocharinro appear to be very closely allied to 

 one anotlier, and to difler chieHy in the characters of the last ahdonii'nal scrrnients and 

 api)cn(lages; the mouth organs also appear to allord important points of distinction 

 111 some cases; very little, however, is really known about them. 



As experience sliows that detailed tables arc of very little use in this 

 genus, they have been omitted ; any student, however, who desires to 

 consult such tables is referred to MuLsant and Rev's Brevipennes 

 Alcochariens, 1873-1875. 



The following are the sections into which the British species, as they 

 stand at present, may be divided : — 



I. Hind body parallel; thorax quadrate (about as broad as lontr) ; the six 

 penultnnate joints of the antenna) longer than broad, or nearly as long as' broad. 



II. Hind body parallel; thorax quadrate or subquadrate; "six penultimate joints of 

 the antenn£B transverse, but not very strongly so. 



Hi. Hind body jiarallel ; thorax quadrate or subquadrate; six penultimate joints of 

 the antenna; sti'ongly transverse. 



IV. Hind body parallel ; thoiax moderately transverse, its sides evenly rounded. 

 . . -^j"*^ ^'"^'-^' I''i'''il'el ; thorax distinctly or strongly transverse ; penultimate 

 joints of the anteuniB not, or only moderately, transverse. 



VI. Hind body parallel; thorax strongly transverse; penultimate joints of the 

 antenna) strongly transverse. 



VII. Hind body more or less distinctly narrowed ; hinder angles of thorax rounded. 



Section I. 



Hind body parallel ; thorax quadrate (about as broad as long), the six 

 penultimate joints of the antennae longer than broad, or nearlv^as Ion" as 

 broad. ^ 



This section may be divided into the following groups: 



1. Hind body with the sixth segment nearly impunctate ; male with a tubercle or 

 keel on the upper side of the sixth segment (p. 67). 



2. Small delicate species, with afl the segments of the hind body punctured- 

 antenna) not at all thickened towards the apex (p. 72). 



3. Species of mod.-rate size, with all the segments of the hind body punctured, and 

 the antenntB shghtly thickened towards the apex (p. 7i). 



4. Male without tubercle or keel on the sixth segment ; hind body with the sixth 

 segment nearly impunctate, the others rather closely punctured, the fifth often more 

 than the fourth (p. 76). 



_ 5. Hind body with the basal segments sparingly punctured, the apical ones nearly 

 nupunctate (p. 70). ■' 



Group 1. 



This group contains the following species : //. currax, languida and 

 rar. longicollk, inserta, paveJis (= s7ilr/jro7is), Eichofli, camhrica, 

 plamfrons ; of these the first four are larger species (4 mm. or nearly), 

 and the last three smaller (3 mm. or less) ; the rar. lonr/irollis of 

 hni'iuida is also 3 mm. in length. According to Dr. Sharp these species 

 are all found on river banks with the exception of 11. hmguida and 



F 2 



