1868.] 
201 
ON SOME BUTTISH DIAPBIAD.^. 
BY THE EEV. T. A. MABSHALL, M.A. 
Genus Spilomicrus, Westw. 
Westw., Introd. vol. ii, Synops. p. 75. 
Hal., Enfc. Mag., ., p. 271 ; N. H. Rev., vol. iv, p. 171. 
. Forster, Hym. Stud., ii, pp. 123, 125. 
Thorns., Ofv., 1858, p. 369. 
Antennce S ? 13-jointed ; iu the ? clavate at the apex, the club 5— 6-jointed, 
much shorter than the body ; in the <? not longer than the body, 2nd joint shorter 
than the 3rd, 3rd joint longer than the 4th. Mesonotum with or without two 
longitudinal impressed striae originating at the scutellum, and becoming obsolete 
anteriorly. Scutellum with two deep oblong basal foveee. Metathorax emarginate 
behind, the angles produced into two small teeth, carinated down the middle. 
Wings with a costal nerve and a sub-costal, which unite before the middle of the 
margin into an oblong punctiform stigma, the apex of which is produced obliquely 
and acuminated downwards in the direction of the disc, emitting from thence a 
short branch turned inwards towards the base, and sometimes slightly produced also 
towards the apes of the wing ; the other nervures wholly indistinct. 2nd segment 
of the abdomen smooth and polished, embracing and concealing the apex of the 
petiole above ; furnished (like the petiole) with white villosity at its base laterally 
and beneath. Anterior tibia? at the inner apical angle with a long curved spur. 
The other genera of this group possessing 13-jointed antennas are Paramesius, 
Westw., and Hemilexis, Forst. (= Entomacis, Forst.), in both sexes,— the males of 
Idiotypa, Forst., and the females of Monelata, Forst. Paramesius, $ , is distin- 
guished from Spilomicrus by having the 3rd joint of the antenna less than half as 
long as the 4th ; the ? of Paramesius has the apex of the abdomen narrowly 
produced and acuminated, which in Spilomicrus, ? , is rounded and comparatively 
blunt. In Eemilexis, $ ? , the 2nd segment is grooved at the base, and the wings 
have no costal nerve. Idiotypa is similarly distinguished. The S of Monelata has 
14-jointed antennae ; the $ has the last joint remarkably large, forming a club of 
itself; and the minute size of the insects (much less than a line) renders them 
unlikely to be confounded with Spilomicrus. 
A. Antennae of the ? having the apical joint smaller than the preceding. 
a. Mesonotum bisulcate at the base. 
1. — Spilomicrus stigmaticalis, Westw. ; Thoms., Ofv., 1858, p. 369. 
Black, shining, antenna9 abruptly clavate, the club 5-jointed ; wings slightly 
infamated ; legs, with the coxae, ferruginous. ? . Long. 1 lin. 
$ . Antennee a little longer than the thorax, 2nd joint not much shorter than 
the 4th, legs fuscous. 
The antennae of the ? have the 2nd joint somewhat longer and thicker than 
the 3rd, 4—8 equal, moniHform, the club abrupt ; petiole rather longer than the 
hind coxae. 
I have seen no specimens exactly answering the above description, taken from 
Thomson, who expresses no doubt as to the sjiecies being the type-insect of West- 
