464 



THE ZOOLOGIST. 



these proceedings for a considerable time, and accompanied 

 some of the ants with pupae back to their nest, quite a 

 distance off, though they covered the ground very quickly. 

 Several trains passed, but the ants did not appear to be dis- 

 turbed, as when I went on to the lines after one had gone 

 through, the ants continued to cross the railway as if nothing 

 had happened. It was unfortunate that I did not witness the 

 start of the expedition, only arriving after the proceedings were 

 in full swing. I believe the only other individuals who have had 

 the good fortune to witness a slave-raid in this country are the 

 great Charles Darwin, F. Smith, and W. Farren- White. 



I now give a description of the two gynandromorphs men- 

 tioned above. They both belong to Dalla Torre and Friese's 

 Group I. Lateral Gynandromorphs (* Ber naturwiss med Ver. in 

 Insbruck,' xxiv. 1898, pp. 3-96) :— 



Formica sanguinea, Latr. (fig. 1). — Nearly complete lateral 

 gynandromorph ; male on right side, worker on left. Eight antenna 

 male, left worker. Right mandible, eye, lateral ocellus, and median 

 ocellus male ; left mandible, eye, and lateral ocellus worker. The 

 head is black, with the exception of the left mandible, left half of 

 clypeus, a small patch before left eye, and left cheek, which are 

 red. Thorax and petiole, male on right, worker on left, the line 

 of division not being quite straight, however, the black colour on 

 the right side of mesonotum encroaching on the red colour of 

 left side. Petiole divided sharply, black on right, red on left 

 side. Gaster black, the right half with male pilosity and sculp- 

 ture, left half worker. External male genitalia are present on 

 the right side, the anal sternite being present only on that side. 

 The red and black colour are sharply defined beneath, but the 

 coxae are all black and red, as in the male, and the legs on both 

 sides are somewhat infuscate, the tarsi on the right side being 

 longer. Winged, of course, only on right side; the veins and 

 stigma are pale, and more like those of the female. L. 7 mm. 



Formica sanguinea, Latr. (fig. 2). — Lateral gynandromorph ; 

 male on left side, female on right. Both antennae female, head 

 somewhat small, but female shape, left eye a little larger than 

 right, ocelli female. Head black, with exception of clypeus and 

 right mandible, which are red ; greater part of thorax red and 

 black, evenly divided laterally, only the top right corner of the 



