Thiasojihila.'] stai'iiylinid-e. 39 



narrowed from apex of third segment, more cdosely puuetured iu front, 

 more sparingly beiiind ; legs reddish testaceous. L. 3 mm. 



Male with the dorsal plate of seventh segment of hind body slightly 

 sinuate, ventral plate produced in a broad angle. 



In nests of Formica rufa. Rather common iu tht» London and Midland and South- 

 E istern districts ; also occurs near S'^arborough and York; I cannot, however, find 

 aiiv record from the north of En;j;land, but the species probably occurs, as in Scotland 

 it is found locally in the Tay, Dee, and Moray districts. 



T. inquilina, Maerk. (diversa, Eey, Eunjnsa Kirhii, Janson). 

 Allied to the preceding, but easily distinguished by its smaller size, 

 shorter and thicker antennse, of which the third joint is not longer than 

 the second, and especially by the shape of the thorax, which is plainly 

 broader at base than the base of the elytra ; the punctuation of the front 

 parts of the body is somewhat closer, and the elytra are often a little 

 more brightly coloured : in the male the dorsal plate of seventh segment 

 of hind body is truncate, and the ventral is prolonged and almost rounded. 

 L. 2f mm. 



Rare; in nests of Formica fiiUginosa ; first taken by Mr. F. Squire in 1857 in the 

 London district, and found subsequently by Dr. Power and others ; Micklehara, 

 Ch:irlton, Darenth, Maidstone, Abbey Wood (Kent), Tilgate Forest, Burnham 

 Beeches; Guestling, near Hastings. 



ZSCHNOG-Z.OSSA, Kraatz. 



This genus contains a feAV species concerning two or three of wdiich 

 some confusion has arisen : at present there are three species in the 

 British catalogues, but the /. "prolixa of our lists appears to be at most a 

 variety of I. prolij-a, Grav., = /. rufopicea, Kr., and with regard to our 

 third species, /. corticina, Er. (which Thomson places in a separate sub- 

 genus Dexiugya), Mulsant and Rey remark, " We will not insist on this 

 well-known species, and will limit ourselves to saying tliat it is only 

 distinguished from the preceding (/. rufoxncea and semirufa) by its less 

 shining colour and smaller size, by having the thorax more visibly sinuate 

 near the posterior angles, and by the absence of erect hairs on the sides ; " 

 the last of these characters appears to be l)y no means a certain one, as 

 erect hairs are visible on the sides of the thorax in both species ; in other 

 points, however, they appear to be sufficiently distinct : they are found 

 under bark of various trees both standing and Jallen. 



Form larger and broader ; sculpture of thorax 



and elytra rather coarser I. PKOLIXA, Grav. {rufopicea, Kr.). 



Form smaller and narrower; sculpture of 



thorax and elytra finer I. coeticina, Er. 



I. prolixa, Grav. {rorticalis, Steph., rufopicea, Kr., ^?ro7<'.v-a, Kr., 

 SHdwglussa j^^'oli^a, Muls. et Eey). Of a lighti^r or darker reddish 

 colour, with the head, and a greater or less part of hind body before 

 apex darker, apex itself testaceous ; antennae entirely red, moderately 



