Melittoinma im^ulare, mid JDascilhis ccrmnus. 277 



Abdomen : The segments are gradually a little wider aud longer 

 up to the 4th or 5tli, and then narrower and shorter up to the 9th ; 

 on the tergites of segments lst-7th there is a median, triangular, 

 faintly depressed, paler-coloured area, at each side of which is a 

 series of small longitudinal carinas ; there are none of these carinas 

 or tubercles on the tergite of the 8th segment ; but on the tergite of 

 the 9th there are two transverse, curved, carina? placed a little in 

 front of the apical processes. The sternite of the 1st segment has a 

 straight, narrow pale band or depressioti across the middle but is 

 without granules or carinse ; the sternites of the 2nd to 8th segments 

 have each a similar, submedian transverse depression, with a 

 granulated area in front and another behind it ; the sternite of the 

 9th segment has a transverse series of granules near its front border, 

 close to the apex there is a curved fold in the integument, and a 

 little in front of this fold, lies the anal, transverse slit. The terminal 

 processes are 3 mm. long, and run almost parallel at a very short 

 distance from one another. 



Legs : The coxjb are inserted obliquely a wide distance apart on 

 each of the thoracic segments ; they are short and scarcely in the 

 least exserted. The femora are stout, of moderate length, and much 

 thicker towards the apex, the tibice are nearly as long as the femora 

 and each is succeeded by a single rather strong claw. 



Sjnracics : Nine pairs, transversely elliptical in form ; the first 

 pair twice as large as the others, placed on the sides of the thorax 

 just below the basal angles of the pronotum, the others placed 

 laterally on the dorsal side of the first eight aljdominal segments, the 

 pair on the 1st segment rather close to the front margin, each suc- 

 ceeding jjair farther back until at the 4th or 5th they come to be at 

 about the middle of the length of the segment. 



In the provisional arrangement of the families of 

 Heteromera made by Ganglbauer in his new system of 

 classification of the Coleoptera, the Tridcnotomidm are 

 placed next to the TenehrioHidm, at the end of the series ; 

 and most authors when comparing TricUnotoma with 

 other Heteromera have professed to find the greatest 

 points of affinity with certain genera of the family Tcnc- 

 hrionidie. But in view of the light thrown upon the 

 subject by the larval characters, these opinions will, I 

 think, have to be altered. The larva of Trictenotoma has 

 not only a diflferent general appearance from all known 

 larva3 of 2\ncljrionidx, but differs also essentially in struc- 

 ture, especially in the wide separation of the legs by the 

 broad sternal plates, On the othe^- hand it has many 



