PAEASIEROLA.— MESITIUS. 455 



and not much narrower than the thorax. The base of the hind coxae is black ; the 

 hind femora are broadly lined above and beneath with black. Wings : the discoidal 

 cellule is rounded at the apex, where it is double the width of the base ; the lower side 

 is longer than the upper. 



3. Parasierola palliditarsis. (Tab. XIX. fig. 22.) 



Nigra, antennis articulis l°-9 m rufo-testaceis, apice coxarum, trochanteribus, geniculis, tibiis tarsisque albo- 



testaceis, tegulis fuscis ; alis famato-hyalinis, nervis testaceis, stigmate fusco. § . 

 Long. 4 millim. 



Hah. Guatemala, Mirandilla 1700 feet (Champion). 



Head alutaceous, semiopaque; the clypeus carinate; eyes large, oblong, situated 

 nearer the front than behind ; occiput slightly convex. First joint of the antennae longer 

 than the following two joints united ; the third joint a little longer and thinner than the 

 second and double the length of the fourth. Mandibles piceous. Prothorax longer 

 than broad, longer than the mesothorax, alutaceous ; mesonotum more shining, 

 shagreened ; scutellum shining, impunctate or nearly so, the transverse furrow at its 

 base shallow ; metanotum finely rugose, the centre shining and impunctate. Abdomen 

 as long as and broader than the thorax, becoming narrower from the second segment ; 

 the segments at their points of junction are testaceous. Wings : the upper discoidal 

 cellule is truncated at the base and apex, of nearly equal length above and beneath ; 

 the upper and lower nervures but slightly curved. 



MESITIUS. 



Mesitius, Spinola, Mem. Accad. Torino, ser. 2 } xiii. p. 72 (1853). 



Isobrachium, Forster, Hymen. Stud. ii. p. 96 (1856) ; Marshall, Ent. Monthly Mag. x. p. 222 (1874). 



Westwood (Trans. Ent. Soc. Lond. 1881, p. 125) refers Heterocoelia, Dahlbom (Hym. 

 Europ. ii., Chrysididee, p. 21), to Mesitius; but as Heterocoelia (supposing that it agrees 

 with it in other respects) has complete parapsidal furrows, I am rather doubtful if it 

 can be regarded as synonymous. The wings are very much as in Epyris, but the hind 

 pair are less developed or much more indistinct. 



The genus is European, but has not, I think, been recorded previously from any 

 part of America. 



l. Mesitius longicollis. (Tab. xix. fig.Mj 



Niger, opacus, metanoto striolato, antennis, trochanteribus, femoribus ex parte, tibiis tarsisque rufo-testaceis ; 



alis hyalinis, nervis pallide testaceis. § . 

 Long, fere 5 millim. 



Hab. Mexico (Salle). 



Antennse scarcely so long as the thorax ; the first joint curved, nearly as long as the 



