EAKINTJS.— MICRODTTS. 401 



sparingly, covered with rather long silvery-white hair ; shining, impunctate. Thorax 

 (except the centre of the mesopleuree) covered with silvery-white hair, shining, impunc- 

 tate ; scutellum bordered along the side, a deep curved depression at its base ; metanotum 

 with two closely placed keels down the centre and another keel near the spiracles. 

 Abdomen as long as the head and thorax united, the underside covered with rather long 

 white hair ; second segment raised at the base, the raised part broader than long and 

 narrowed towards the apex. Wings : areolet straight, of equal width, a little longer 

 than broad, a short nervure issuing from the middle of the outer nervure. 



MICRODUS. 



Microdus, Nees, Act. Acad. Leop.-Carol. Nat. Cur. 1818, p. 304. 

 Eumicrodus, Forster, Verh. Ver. pr. Rheinl. xix. p. 247 (1862) . 



A genus of world-wide distribution. 



1. Suturiform articulation obsolete (unless the broad, smooth, transverse furrow on the 

 second segment in M. basimacula and its allies represents it). 



A. Abdomen without transverse furrows on the second and following segments ; petiole 

 not distinctly raised in the centre ; ovipositor shorter than the petiole. 



a. Body more or less yellow ; wings yellowish, banded with violaceous or black. 



1 (6) . Mesonotum more or less black. 



2 (3) . Mesopleurse and face black ; hind coxae yellow melanostoma. 



3 (2) . Mesopleurse and face yellow ; hind coxae black. 



4 (5). Hind femora yellow pulchripennis. 



5 (4) . Hind femora black championi. 



6 (1). Thorax without black. 



7 (8). Hind femora black peronatus. 



8 (7) . Hind femora yellow coxalis. 



Ar l. Microdus melanostoma. (Tab. XVI. fig. 15, s .) 



Luteus, antennis, capite, pro- et mesothorace, tibiis tarsisque posticis abdominisque apice late nigris ; alis flavo- 



hyalinis, fusco bifasciatis, stigmate flavo. <S . 

 Long. 10-11 millim. 



Hab. Panama, Bugaba [Champion). 



Antennae considerably longer than the body; densely pilose, except the scape. Face 

 bearing shallow punctures ; the fovese over the clypeus large, wide, deep ; the frontal 

 depression continuous, deep ; a rather long furrow behind the eyes at the top. Middle 

 lobe of the mesonotum raised, but without a bordering furrow, its top shagreened; 

 metanotal arese obsolete, or nearly so. Abdomen about the length of the head and 



biol. centr.-amek., Hymenopt., August 1887. 3 fp 



■0 Q 



