222 [March, 



Not being able to find a description applicable to this species, I 

 forwarded specimens to Mr. Snellen van Vollenhoveu and to Herr 

 Brischke, of Danzig, wlio have both kindly informed me that it is 

 undescribed. It is closely allied to, but cannot be confounded with, 

 iV. ohductus, Kl. 



G-lasgow : 4:th February, 1874. 



DESCEIPTION OF A NEW EUEOPEAN SPECIES OF BETni'LIDES 

 (RYMENOPTERA : OXYURA). 



BY THE EEV. T. A. MAESHALL, M.A., F.L.S. 



Genus ISOBEACHIUM, Forst. 

 Hym. Stud., ii, 96. 

 This genus is distinguished from the other Bethyloid genera by 

 having the middle longitudinal nervure divided at the apex into two 

 equal branches. It is nearest to Epyris, AVestw., but the thoracic 

 sutures are invisible, and the abdominal segments of unequal length. 

 I suspect that Mesifiiis, Spin., is a synonym, but cannot succeed in 

 finding the description of that genus, if indeed it be anything more 

 than MS. Isohmcldum has no representative in England, but several 

 undescribed forms from the South of Europe are in my possession, as 

 well as I. dicliotomum, Forst., of which I found both sexes at Aries. 



IsOBEACniUM MACULIPEXlvE, Sp. 11. 



I. nigrum, nitidum, oris partibus, antennarum articu^o 1° hasi et 

 opice, 2° apice, troclianterihus^femoribus tibiisque hasi et apice, una cum 

 tarsis, piceo-rufis : capite crchre, iliorace et scutelh parce, punctulatis : 

 metathorace longitudinaliter striata, inter strins riigidoso : alis sui- 

 infmnatis, fascia ante medium maculaqiie magna pone medium fuscis, 

 macula media hyalina. $ . Long. 2\ ; alar. exp. 2f lin. 



Sahitat, Corsica. 



Antenna} filiform, twice as long as the head ; the scape as long as the two fol- 

 lowing joints, stout, curved ; 1st joint of the flagellum once and a half as long as 

 the 2nd ; 2nd joint longer than the 3rd ; the rest sub-equal, cylindrical. Head 

 broader than the tliorax, depressed, sub-quadrate, rather thickly punctured. Tliorai 

 and scutellum witli finer and more remote punctures. Prothorax largely developed, 

 three times longer than the mesotliorax, rounded and narrowed in front, widened and 

 angularly produced on eacli side behind. Scutellum with two basal fovese connected 

 by a transverse groove. Metathorax sub-quadrate, horizontal, truncated behind per- 

 pendicularly, longitudinally striated, and rugulose between tlie strite. Abdomen 

 shining, inipunctate, pyriform, very convex, widest just before the middle, acuminated 



