HYMENOPTERA. 7 



the mandibles rufo-piceous. Thorax above clothed with ochra- 

 ceous pubescence, beneath and on the femora it is of a paler hue ; 

 on the metathorax and on the basal segment of the abdomen it 

 is nearly white ; the legs rufo-piceous, above clothed with fus- 

 cous pubescence ; the posterior tibiae and basal joint of the tarsi 

 dilated, the former bent inwardly ; the anterior tibiae bright fer- 

 ruginous in front ; on the metathorax below the post-scutellum 

 is a smooth shining enclosed space ; the wings hyaline, their ner- 

 vures and tegulae rufo-testaceous. Abdomen dark rufo-testa- 

 ceous, having a green metaUic tinge, finely punctured, the basal 

 segment slightly sinuated at its anterior margin ; the fifth and 

 sixth segments clothed with black pubescence, the latter has a 

 central longitudinal smooth space. The margins of the segments 

 beneath are fringed with pale ochraceous pubescence. The 

 pubescence on the thorax viewed imder a moderate magnifying 

 power is beautifully plumose. 

 Hab. Swan River. 



Genus 3. PTILOGLOSSA. 



Ptiloglossa, F. Smith's MSS. 



Head transverse, much narrower than the thorax ; eyes slightly 

 approximating at theii- vertex, ocelh placed in a triangle. The 

 third joint of the antennae clavate, about the same length as the 

 scape, the fourth very short, the rest of about equal length. The 

 mentum elongate, narrowed towards the base, which is roimded ; 

 the apex blunted ; the labium very short, densely pubescent ; 

 the paraglossae elongate, very pubescent ; the labial palpi four- 

 jointed, short and stout ; the basal joint cylinch-ic, as long as the 

 two following ; maxillary palpi six-jointed, gradually attenuating 

 to the apex ; the second to the fourth joints slightly narrowed 

 at theu- base ; the labrum rounded. Thorax rounded ; the an- 

 terior wings having one elongate marginal cell pointed at the 

 base, the extreme apex truncate, the first submarginal cell rather 

 longer than the two following, the second very narrow, attenuated 

 towards the marginal ; the first recurrent nervure uniting with 

 the first, and the second uniting with the third transverse ner- 

 vure. Abdomen nearly conical, emarginate at the base. (Plate I. 

 Details.) 



1, Ptiloglossa ducalis. 



Female. Length 8 lines. — Head and thorax black, the clypeus 

 very convex, naked ; the face otherwise clothed with short gri- 

 seous pubescence intermixed with long black hairs ; the cheeks 

 clothed with white pubescence. Thorax densely clothed above 



