1896 THE MICROSCOPE. 181 



outer surface of the oesophagus to a ganglion lying in 

 the crop auil giving off two brandies. 



The sense organs are the rnaxilhiry palpi, the labial 

 palpi, the antennse, and perhaps the oval cerci. The 

 antennfB consist of three basal joints and 92 others. 



The pale meinbranoas patches or fenatrse, (fig. 4, c) 

 near the eyes and the bases of the antennsB, are regarded 

 as remnants of the simple eyes or ocelli. The true pyes 

 (fig. 4, b) are large, black, reniform, compouud, with 

 many hexagonal f.icets and were described in the article 

 on the honey-bee (Nov. 1895). It is probable that each 

 of those long ocelli or cones enables the insect to see the 

 particular part of the object commanded by that partic- 

 ular cone, and the vision of the insect is peicemeal, or 

 what is known as mosaic vision. 



The cockroaches run or get about at great speed. Their 

 legs adapted for running, are three pairs, attached re- 

 spectively to the pro-meso-meta-thorax. The legs are 

 much alike. The joints, reckoning from the body out, are 

 the coxa (fig. 8, a);lrochanter, (fig. 8, b), ferma (fig. 8, c), 

 tibia (fig. 8, d), tarsus (fig. 8, e). The coxa are large and 

 cover the tliree thoracic sternaaudthe base of the abdomen. 

 On thefermaaudtibiaare spines. The tarsus has five joints, 

 the fifth of which ends in two claws. The male cock- 

 roach has two styles on the hind margin of the ventral 

 aspect of the ninth abdominal somite. Also, he has the 

 anal cerci, which are attached to the edge of the aide of 

 the tenth abdominal somite, and have manyjoints. 



The two pairs of wings are attached to the meso-meta- 

 thorax. The front meso-thoracic pair (fig. 9, a) are small 

 and hard and called elytras or tegmina. They arise 

 from the front corners of the terga of the meso-thorax, 

 are made up of cuticle and skin. The wings (fig. 9, b) 

 arise from the anterior corners of the terga of the meso- 

 thorax and meta thorax, are membranous, and traversed 

 by trachsB. 



