IPHIAULAX 345 



** Ah domen punctured* (Species 24.) 



24. Iphiaulax brachyura. 



Rufus ; antennis, capite, prosterno, mesosterno pedibusque, nigris ; alis nigris, stigmate ochreo. § . 

 Long. 9 minim. ; terebra 1-5 millim. 



Hob. Panama (JBoucard). 



Face closely punctured, covered with longish white hair ; front not depressed ; a longi- 

 tudinal furrow running down from the ocelli. Thorax flat above ; the metanotum rather 

 long, with a gradual and very gentle slope to the apex ; sides and breast covered with 

 longish white hair. Petiole with the inner furrow broad and shallow. Second segment 

 with the central area at the base triangular, but prolonged at the apex into a sharp 

 broad keel ; the lateral depression broad and deep at the apex ; the transverse groove 

 broad, striated, the basal fork narrow and not very distinct ; on the raised central part, 

 in front of the transverse groove, are some shallow punctures ; the part beyond the 

 suturiform articulation more strongly and closely punctured. Third segment not so 

 strongly nor closely punctured, the sides aciculated. Apical segments hairy, blackish. 



The group of I. stjavis. 



Keel on the second segment short, broader than long, not reaching to the middle; 

 surrounded by a broad, but not very deep, depression ; the lateral depression wide, 

 oblique, not very deep. Inner furrow of the petiole wide, and with some transverse 

 keels. Suturiform articulation shallow, not striated ; the apical branch much wider 

 than the basal one, which latter is not clearly defined. Abdomen longer than the head 

 and thorax united, becoming gradually thinner from the second segment ; the seg- 

 mental divisions deep; the apical ventral segment not ploughshare-shaped. Head 

 small, narrow, not much developed behind the eyes, the latter oval. Abdomen red; 

 head and thorax black ; wings black, the stigma ochreous. (Species 25 & 26.) 



The colour of the wings and stigma brings this group near to the preceding ; but the 

 structure of the second segment separates the two, the area being triangular and broader 

 than long ; and the thorax is entirely black. 



1 (2) . Wings entirely black suavis. 



2 (1) . Wings with the basal third subhyaline piliventris. 



25. Iphiaulax suavis. 



Niger ; abdomine rufo, apice nigro ; alis nigris, stigmate flavo. $ . 

 Long. 11-12 millim. ; terebra 2-2-5 millim. 



Hab. Guatemala, San Ger6nimo (Champion); Panama, Taboga Island (Champion). 



Antennae as long as the body, microscopically pilose. Head depressed, broadly but 

 not deeply, above the antennae, the sides of the depression striated obliquely, the stria- 

 biol. centk.-amee., Hymenopt., January 1887. 2 tt 



