88 
William Molton Wheelee. 
Inst. Koenigsberg Coli. 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 (withont a number) 
contains at least 20 workers of I. geinitzi. 
The pupse which I have referred to this species are naked, sho wr- 
ing that the larval habit of spinning a cocoon before pupation, still 
preserved in the Ponerince and most Camponotince down to the present 
day, had been abandoned by the Dolichoderince as long ago as Oligo- 
cene times. 
lridomyrmex constrictus (Mayr). 
Hypoclinea constricta Mayl, Beitr. Naturk. Preuss. I, 1868, p. 60, Taf. III, Figs. 50, 
51 ,s cf. 
Bothriomyrmex constrictus Dalla Tolle, Catalog. Hymen VII, 1893, p. 170; Eln. 
Andle, Bull. Soc. Zool. France, XX, 1895, p. 82; Handlilsch, Foss. 
Insekt. 1908, p. 870. 
This species, too, is a true lridomyrmex, with 6-jointed maxillary 
and 4-jointed labial palpi, although the former are shorter than in 
I. geinitzi. It also resembles rather closely certain Anstralian species 
of the genus, notably I. itinerans Lowne, gilberti Forel and innocens 
Forel. The worker of I. constrictus is readily distingnished 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 antennse are shorter, the scapes barely snrpassing 
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, abont l 1 ^ times as long as broad. 
The mesoepinotal constriction is longitudinally rngose. The body is 
rather abundantly hairy, the antennal scapes with a few erect hairs 
on their anterior snrfaces 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 Coli. 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, 
