102 



anterior lobes, which may be called the scutellum, is semilunar, 

 and extremely small compared with the great triangular anter- 

 ior lobe, not penetrating forwards between the lateral lobes. 

 The post-scutellum also is unusually short. 



In Halictophagus and Brucsia, (PI. II, fig. 9) the scutellum is 

 triangular, but much smaller than the anterior lobe, penetrating 

 somewhat between the lateral lobes, the post-scutellum being 

 very elongate. In a genus allied to Xcnos there is a great tri- 

 angular scutellum, produced far forwards between the lateral 

 lobes and longer than the anterior lobe (PI. II, fig. lo). It is 

 clear that the structure of the thorax will prove of great use in 

 the classification of Stylopidae. The great differences between 

 the tarsi of the several subfamilies are shown in PI. II, figs. 6, 

 7 and 8, and also the wings of Elenchus, Brucsia and ? Halic- 

 tophagus on the same plate (figs, i, 2, 3), so that it is not neces- 

 sary to refer further to these. 



DESCRIPTIONS OF GENERA AND SPECIES. 



Brucsia n. subg. (of Halictophagus). 



Head very deeply concave behind, seen from above consisting 

 only of a narrow rim supporting the eyes, and produced con- 

 siderably in front of these to form the tip of the blunt and wide 

 frontal projection, at the sides of which the antennae are insert- 

 ed. That which appears to be the top of the head on super- 

 ficial inspection, is in reality the dorsum of the pro- and meso- 

 thorax, which in their natural position are deeply immersed 

 within the posterior concavity of the head, which they more or 

 less fill up. Antennae with the two basal joints simple, the fol- 

 lowing excessively short, being produced laterally into an elon- 

 gate and thin lamina, the first and fifth (or last) of these laminae 

 being larger than the others and capable of enclosing them in a 

 fan-like fashion. Mandibles very short compared with thosi 

 of other Stylopids, their tips not reaching one another, simply 

 pointed. Labial palpi very large, the second joint foliaceous 

 I'.alf as wide as long, pilose, subacuminate at the apex. Scutel- 

 lar portion of metanotum moderately large, penetrating some- 

 what between the lateral lobes of its anterior portion, trian- 

 gular, and very different from the small semilunar scutellum of 

 Elenchus; the post sctitellum very elongate, twice as long as 

 wide, or appearing still longer in dry specimens, covering sev- 

 eral of the basal abdominal segments. Elytra clavate or ladle- 

 sliaped in well-preserved specimens, Wings smoky hyaline, 



