IJijmnxopUroun Genera Myzine and Plesia. 509 



Black; tlie extreme apex of the pygidiiim testaceous; tiie 

 pubescence orcyisli, |)ale fulvous on the sides of the abdomen; 

 the spines of the tib'se and tarsi pale ferruginous. AVnigs 

 dark fuscous, fjlossed with [)urple ; nervures black. 



J.ennth lG-18 mm. 



llah. p]ntrance Island, China (.7. /. Wallcer). 



Type in B. M. De-jcribed from two specimens. 



This seems to be the Chinese form of F. madraffpatana, 

 Sm., from which it differs by the entirely black colour of the 

 abdomen. The second cubital cell is also rather longer on 

 the radial nervure. 



Plesia (Mesa) mandihularis, Sm. 

 Meihoca mandihularis, Sm. Trans. Ent. Sec. LondoD, p. 301 (18G9), ^ . 



This is probably the male of the last-described species. 

 It is very near diinidiata, Guer.^ from which it may be dis- 

 tinguished by the paler colour o£ the wings and the rather 

 shorter clypeus, also by the more distinct sulcus on tlie 

 median segment. 



Plesia {Mesa) opacifrons, sp. n. 



? . Clypeus short, very broadly truncated at the apex, the 

 base punctured, the apex broadly depressed transversely, 

 Oj)aque and smooth. Scape smooth above, sparsely punc- 

 tured beneath and with a few long fulvous hairs; flagellum 

 o])aque, the first joint smooth and shining. Front oj aque, 

 almost smooth, Avith a few large scattered punctures, the 

 interantennal prominence strongly bilobed, divided by a 

 sulcus wdiich reaches more than halfway to (he anterior 

 ocellus ; vertex shining, finely and very sparsely punctured, 

 the space round the ocelli smooth. Thorax shining, sparsely 

 and rather finely punctured ; the mesonotum with two longi- 

 tudinal sulci on each side, the iinier sulci not very strongly 

 convergent posteriorly. Propleur:ii closely and finely- 



punctured, mesopleurffi more strongly punctured. Median 

 segment closely obliquely striated on the sides ; the dorsal 

 surface very closely and finely punctured, some of the 

 punctures confluent, with a smooth shining space on each 

 side near the middle; two parallel carinas from the base not 

 reaching the apex, very near together, the space between 

 them finely rugose; the surface of the ob'ique posterior 

 truncation finely aciculate, with scattered shallow punctures. 

 Abdomen shining, evenly, but not very closely punctured ; 

 the sccoud scguicut almost smooth ; the anterior truncation 



