gg William Mokton Wheeler. 



Inst. Koenigsberg Coll. 61 of the 66 specimens, including the types, 

 recorded by Mayr as belonging to the Physical Economic Society Col- 

 lection. One large piece of amber in this collection (without a number) 

 contains at least 20 workers of I. geinitzi. 



The pupae which I have referred to this species are naked, show- 

 ing that the larval habit of spinning a cocoon before pupation, still 

 preserved in the Ponerince and most Camyonotinm down to the present 

 day, had been abandoned by the Bolichoderince as long ago as Oligo- 

 cene times. 



Iridomyrmex constrictus (Mayr). 



Hypoclinea constricta Mayr, Beitr. Naturk. Preuss. I, 1868, p. 60, Taf. Ill, Figs. 50, 



51,$cf. 

 Bothriomyrmex constrictus Dalla Torre, Catalog. Hymen VII; 1893, p. 170; Ern. 

 Andre, Bull. Soc. Zool. France, XX, 1895, p. 82; Handlirsoh, Foss. 

 Insekt. 1908, p. 870. 



This species, too, is a true Iridomyrmex, with 6-jointed maxillary 

 and 4-jointed labial palpi, although the former are shorter than in 

 I. geinitzi. It also resembles rather closely certain Australian species 

 of the genus, notably I. itinerans Lowne, gilberti Forel and innocens 

 FoREL. The worker of I. constrictus is readily distinguished from that 

 of I. geinitzi by the shape of the thorax. The mesoepinotal constriction 

 is much more pronounced, the epinotum is short and convex and 

 when seen in profile its base and declivity meet at a right angle, the 

 base rising obliquely upward and backward from the constriction. 

 The base is straight in profile, the declivity longer and slightly concave. 

 The whole body in I. constrictus is stouter and less graceful than in 

 I. geinitzi, and the antennae are shorter, the scapes barely surpassing 

 the posterior border of the head, the basal funicular joint is fully 

 3 times as long as broad, the second joint twice as long as broad, 

 the remaining joints, except the last, about 1^2 times as long as broad. 

 The mesoepinotal constriction is longitudinally rugose. The body is 

 rather abundantly hairy, the antennal scapes with a few erect hairs 

 on their anterior surfaces as well as at their tips. 



Mayr described as a gynandromorph („Zwitter") of this species 

 a very interesting specimen. No. 7595/309, in the Geolog. Inst. Koenigs- 

 berg Coll. This specimen which I have examined and represent in the 

 accompanying outline figure (Fig. 42) must however, I believe, be 

 regarded as an ergatomorphic male like those found among certain 

 recent species of the genera Ponera, Cardiocondyla, Formicoxenus, 

 Symmyrmica and Technomyrmex. The general structure of the head, 



