64 
Psyche 
[April 
attachment for the abdomen. The pleuron of this segment is 
divided into metaepisternum (es^) and metaepimeron (em^). 
A spiracle (sp) is present just before the metaepisternum, as 
before the mesoepisternum. The region around the base of the 
haltere is so modified that it is impossible to tell whether pre 
and post alar bridges connect the metanotum with the meta- 
pleuron. 
Some of the terms used above are different from those in 
common use among taxonomists. The mesoanepisternum (aes^) 
has been called by dipterists the mesopleura. The mesosterno- 
pleurite (stp^) is equivalent to the sternopleura of authors, 
while the meropleurite (mep2) plus metapleuron plus meta- 
sternum equals the hypopleurite, so-called. 
Chaetotaxy of the Thorax, The thorax of T. pennipes is not 
heavily armed with macrochsetse. However, representatives of 
most of the groups mentioned by Walton are present. Two 
humerals (hu) adorn each humeral callus. Posthumerals are 
wanting, as are anterior acrosticals. The anterior dorsocentral 
rows are represented by two very variable bristles (adc) placed 
near the hinder margin of the prescutum, while at each rear 
corner of this sclerite are borne two notopleural bristles (np). 
On each side, between the notopleurals and the anterior dorso- 
centrals, lies a single bristle, the presutural (psu). 
On either side of the scutum a single bristle (sa) represents 
the supra-alar row, and another (ia) each intra-alar row. Two 
post alars (pa) are present, and each of the posterior dorso- 
central (pdc) and posterior acrostical (pac) rows is represented 
by a single bristle. It will be seen that these last four bristles 
form a transverse row near the hind margin of the scutum. This 
is called the prescutellar row. 
On the scutellum an anterior bristle and a posterior bristle 
mark the position of the marginal scutellar row (ms). The 
anterior bristle was seen to be accompanied by a smaller one in 
one or two specimens. No discal scutellars are present. 
The mesoanepisternum bears a vertical row of bristles 
called the mesopleural row (mr), situated just before the mem- 
brane which divides it. Below the anterior spiracle are two 
