1152 COLEOPTEKA 



and slender, the tibia quite slender, and with two short but distinct 

 spurs. The tarsi are all slender ; the pubescence is on the basal 

 joint divided by an impressed line ; the penultimate is a little pro- 

 longed beneath the terminal joint. 



The most natural position for this genus is, in my opinion, near 

 Adelium and Cilibe; the form of the eyes and the concealed inser- 

 tion of the antennae remove it considerably from Pascoe's Syrphe- 

 todes, and from the extremely curious genus Paraphylax, Broun, 

 which is remarkable on account of the neck of the mesothorax being 

 greatly and abruptly below the level of the base of the elytra. 



2041. P. sordidum, n.s. (Sharp; Trans. Boy. Dub. Soc., 

 1886, p. 406.) Fuscum, opacum, depressum, prothoracis lateribus 

 explanato-elevatis ; elytris per paria striatim minute asperato- 

 punctatis, inter paria hie inde vix tuberculatis, ante apicem tuber- 

 culis parum elevatis. 



Long., 12mm. 



This is extremely similar to White's 0. tuberculicostatum, but 

 the remarkable sculpture of that insect is present here in a rather 

 more rudimentary condition, the head is not so broad and the 

 antenna are not so elongate. The surface is sparsely studded with 

 depressed flavescent setae. The anterior angles of the thorax are 

 much produced, and the disc is rendered uneven by some indistinct 

 depressions. The scutellum is remarkably small. Along each wing- 

 case there are three or four irregular stripes formed by minute 

 asperities and punctures placed in pairs ; the surface between these 

 is scarcely at all elevated, but here and there is slightly swollen 

 laterally; just before the declivous apex there are three slight 

 tubercles on each elytron, the margin is elevated, and within it are 

 coarse, indefinite depressions. 



Picton. Helms ; one example. 



Periatrum. 



Nov. gen. 

 (Sharp ; Trans. Boy. Dub. Soc., 1886, p. 407.) 



Pseudopatri affine. Caput utrinque supra oculos fere planum, 

 his subtransversis vix sinuatis. Antenna articulo tertio sat elongate. 



Although this insect is closely allied to Pseudopatrum, the dif- 

 ferences in the head and eyes, accompanied by other less important 

 peculiarities, warrant its generic differentiation, though the im- 

 portant points of structure are similar. Neither the clypeus nor the 

 labrum is ernarginate. The tibial spurs are extremely obscure, and 

 the tarsi are quite slender. The pseudepipleurce are extremely broad 

 at the base, and there are well defined and acutely inflexed ; they 

 are not marked off from the upper surface by a margin, but by a 

 sort of tuberculation ; this becomes coarser behind, so that towards 

 the extremity the pseudepipleura have ceased to exist ; there is no 

 trace of the extraordinary fossae that exist on them in Pseudopatrum. 

 This interesting form may, if an intermediate should be discovered, 



