CLAVICORNIA. 107 



siderably longer than together broad, parallel-sided, distinctly punc- 

 tured, with sutural stria and fovesB much as in the preceding species ; 

 abdomen long, widely and very deeply margined ; legs testaceous, long 

 and slender. L. f-|- mm. 



Male with the apical ventral segment marked throughout its length 

 with three lines, of which the central is the deepest ; the latter is deeply 

 grooved on each side, and the lateral lines are incurved at apex ; the 

 penultimate segment is depressed deeply at apex, the depression corre- 

 sponding with the depressed portion of the apical segment ; the inner 

 side of the intermediate tibise is prolonged beyond the articulation of the 

 tarsus, and curved inwardly in the shape of a hook. 



Female with the apical segment produced into a long aculeate spine. 



This rare species was taken by Mr. Garneys and myself in large 

 numbers in flood refuse from the Trent near Eepton in June, 1879; it 

 has not occurred before or since in Britain, and is rare on the continent ; 

 it is extremely sluggish, and may very easily be passed over ; even with 

 the flood refuse on a dish before me I found it very hard to find, 

 although it was present in numbers ; for a more detailed account of the 

 species the student is referred to the Entomologist's Monthly Magazine, 

 xvi. pp. 158, 159. 



TRICHOPTERYGIDJE. 



This family comprises the smallest known species of all the Coleoptera : 

 owing to their minute size and the difficulty of determining the species 

 they have usually been much neglected ; the Monograph, however, of the 

 family published by the Kev. A. Matthews, is most complete, and by 

 the aid of the figures and descriptions there given, many of the diffi- 

 culties are very much diminished ; the chief character of the family lies 

 in the wings, which are very long and narrow, and consist of a horny 

 peduncle from which proceeds a long slip of membrane which is fur- 

 nished on both sides with very long and thickly set hairs; hence the name 

 of " Trichopterygidse," or "hair-winged;" the antennae are long and 

 slender, and usually verti cillate-pilose, with the two basal joints large and 

 stout, and the three apical joints forming a more or less distinct club ; the 

 maxillary palpi have the penultimate joint much inflated, and the last 

 joint small and more or less acicular : the mandibles are very curious, 

 the outer-side being furnished with transverse ribs like the cogs of a 

 wheel ; these are used for mastication, the insect having the power of 

 seizing its prey (which consists of very minute insects), with the sharp 

 points of the mandibles, and then turning these latter inwards until their 

 backs meet, when the cogged processes act upon each other, and first 

 crush and then grind the food between them (Matthews, Trichopt. 111. 

 p. 43) ; the elytra are sometimes entire, sometimes truncate, and together 

 with the thorax are comparatively seldom punctured, the sculpture 

 usually taking the form of asperate raised points, as in a rasp ; the 

 abdomen is usually composed above of nine segments, the ventral por- 



