22 ME. a, BEOOK O^S^ SOME 



wart-like deutes, eacli with an extremely small aud indistinct 

 mucro. 



Tricena mirabilh is a small blue-grey insect about \\ millim. 

 long, witli distinct eye-patclies as in Achorutes. The three anal 

 spines are rather large for the size of the insect, and broader 

 towards the base. Besides the spines the fifth abdominal segment 

 is usually provided with strong hairs which, unless accurately 

 focused, look broad enough at the base to be taken for spines. 



TuUberg found his specimens under boards in a farmyard and 

 also amongst seaweed cast up on the shore. My specimens, 

 five in number, were also found under boards in my garden. One 

 appears to have had five anal spines. There are the usual three 

 on the sixth abdominal segment ; aud some considerable distance 

 higher up, above the middle of the fifth abdominal segment, is a 

 fourth spine similar in all respects to the others ; but the corre- 

 sponding one on the other side appears to have been broken off. 

 The specimen appears to agree with T. mirahilis in'other respects, 

 so that perhaps this is only an accidental variation. 



ToMOCERTJS VULGARIS, Tullb. Fort. CEfver., Sv, Podur. 1871. 

 (PI. I. figs. 15-19.) 



Tullberg's diagnosis of this species is as follows : — "Antennae 

 corpore non longiores. Spinse dentium simplices 12-16, intima 

 magna. Unguiculus superior dentibus -1-6 armatus ; inferior 

 muticus, lanceolatus. Long. 4 mm." Tullberg gives the ground- 

 colour as grey, and the locality under bits of wood, bricks, &c. 

 near houses. My specimens agree almost exactly with the 

 above description, but the body-colour is rather dirty yellow 

 than grey. But here, as has been usual with the specimens I 

 have examined of other species, the body-colour was sometimes 

 tinted with a reddish brown. Of course I speak of specimens in 

 spirit ; what the body-colour may have been when the insect 

 was alive I cannot say. This species is easily distinguished 

 from T. tridentifenis by the simple spines on the spring and by 

 the lanceolate lower claw. The spines are arranged with a slight 

 curve at the end nearest the manubrium, very much as in 

 T. tridentiferus. In this genus, and particularly in this species, 

 the claws are large and show well both the pseudonychia aud 

 the double lamelliform nature of the upper claw. As Avill be 

 seen from the figure, the upper claw consists of two thin plates 

 cemented together along the outer margin, but at such an angle 



