MORLEY— HYMENOPTERA, ICHNEUMONID^ 177 



A single pair has reached me from the Isle of Mahe ; the typical female was found in 

 the high forest of Morne Blanc and Pilot, during November, 1908 ; and the male is from 

 the country above Port Glaud, at an altitude of between five hundred and a thousand feet, 

 on the 5th of the same month. 



DicoLUS Forster, Verb. pr. Kheinl., 1868, p. 171. 



Head small ; labrum not exserted ; clypeus convex and laterally compressed ; basal 

 flagellar joint longer than the second ; flagellar joints of $ not emarginate ; metathorax 

 transimpressed before its central carina, of $ not apically truncate ; terebra elongately 

 exserted ; hind coxte nitidulous and femora mutic, their tibise subincrassate and basally 

 distinctly constricted ; stigma broadly triangular and not small ; areolet wanting ; median 

 nervure of hind wing not basally evanescent. 



The Plectiscini have received so inadequate attention that it appears expedient to 

 shortly summarise the characters upon the strength of which I consider the following 

 species should be included in the present genus, which was employed by Prof Thomson 

 as a subdivision of Megastylus Schiodte, though not so classed by its author in 1871. 

 I have heard of the description of no species outside Europe, and on that account alone 

 tentatively describe the following as new. 



16. Dicolus equatorius, sp. n. 



A small, nitidulous, black insect with the prothorax, legs except apically and centre 

 of abdomen, pale. Head glabrous, nitidulous and a little transverse, black with the 

 mouth and apex of the prominent clypeus testaceous ; ocelli and face at base of antennae 

 distinctly elevated ; face shining and evenly rounded throughout. Antennae black and 

 pilose, as long as the body, slender and apically attenuate, with the pale scape and the 

 flagellar joints elongate. Thorax strongly nitidulous and subgiabrous ; mesonotum 

 convex, with a strong central longitudinal impression ; prothorax rufescent ; mesopleurte 

 transimpressed below radices ; metathorax small and hardly sculptured, but with the 

 lateral costse complete and a strong central transcarina ; apophyses small and subacute. 

 Scutellum smooth, black and convex. Abdomen black or nigrescent, with apex of second 

 and disc or whole of third segment indefinitely flavidous ; basal segment convex and 

 linear, exactly parallel-sided, fully thrice longer than broad, discally subcarinate and 

 basally concave ; following broader, not compressed, nitidulous and sparsely white-pilose ; 

 $ valvulPB not exserted ; terebra fully half length of abdomen, slightly reflexed, black and 

 pilose, with the spicula red and acuminate. Legs clear testaceous with all the tarsi, the 

 stout and pilose hind tibiaj with base and apex of their femora, subnigrescent ; pulvilli 

 shorter than the slender, curved claws ; calcaria short and inconspicuous. Wings ample 

 and hyaline ; stigma and tegulre piceous, radix testaceous ; radial and cubital nervures 

 evenly curved throughout, forming no areolet, and the latter continuous with the 

 bifenestrate second recurrent ; basal nervure continuous ; nervellus entire, postfurcal and 

 not intercepted. Length, 3 mm. $'^. 



Two males were found in the high country of Silhouette, near Mont Pot-a-eau, during 

 August, 1908 ; the remainder are from Mahe and comprise three males from the slopes of 



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