DESCRIPTIONS OF A PTKREUGATK. 269 



Epinotnm pale yellow, spines long and straight ; gastcr brownisli-yellow. 

 Long 5-2nini. 



The colony contained two (|ueens, tionie males and brood. No 

 further pterergates were produced, and only males hatched from the 

 sex pupiB present. 



As far as I am aware this is only the second pterergate which has 

 been taken in Britain. The other, which was taken by Keys, near 

 Plymouth, is described in my book {Urititi/i Ants, p. 181). 



The colony which contained the two gynandromorphs was nesting 

 in the ground, a small hole in the turf forming the entrance. It con- 

 tained one queen, some normal males, sex pupa}, and small larvjp. 

 This colony has been kept under observation ever since it was dug up 

 all the pupil! hatched and produced only normal males. The two 

 gynandromorphs were noticed at once and bottled in the field. 



Descriptions. 



No. 1. Mixed Gynandroniorph. 



Head ? shape ; clypeus anteriorly, mandibles, antennte, cheeks, right temple, 

 a thin streak on left temple, frontal carin;o, and a patch on left side of front red, 

 rest of head blackish. Left eye a little larger than light eye ; ocelli a little larger 

 and more prominent than in a normal ? ; antennae 12jointed, with 8-jointed clubs, 

 but with shorter and stouter scapes than in normal v , left scape more the shape 

 of d , and without the tooth at the bend, right scape with tooth. 



Thorax : proiiotum red with dark patches anteriorly, in centre, and on left 

 side posteriorly ; mesonotum with distinct Mayrian furrows, the right side and the 

 space between the furrows black, the left side red, and the right parapsis red. 

 The space between the Mayrian furrows is channelled in centre, which is not the 

 case in either normal j or ? , the rest being slightly striate ; scutellum and 

 praescutellum black on right side ; metanotum black. Epinotum ? , but black at 

 base and between the spines, right spine shorter than left ; petiole small, de- 

 formed, black at base and left corner, fixed to right half of pcst-petiole ; post- 

 petiole larger on left side with a dark longitudinal mark in centre, right side 

 blackish at base; gaster more ? shape and bristles, dirty blackish-yellow with ill- 

 delined darker patches and round yellow spots, with five visible segments and 

 ordinary s genitalia. 



Wings intermediate between j and ? . Legs intermediate between j and v , 

 partly black, partly yellow. Long. 5-7mm. 



No. 2. Mixed Gynandroniorph. 



Head shape of ? ; right mandible at base, clypeus in centre and on left, 

 frontal area, front, temples, and occiput, with the exception of certain round spots, 

 black, rest of head yellow. Antenna; ? , 12jointed, with H-jointed clubs, but 

 right scape more shape of <? , and black above. 



Thorax : pronotuin yellow with two black patches posteriorly ; mesonotum 

 with part of Mayrian fnrrow present on right side, and a black patch, the shape of 

 of the space between the Mayrian furrows if both were present, in centre ; a broad 

 black patch occurs on the right parapsidal furrow and a narrow one on the left ; 

 scutellum black wi'jh the exception of a red patch on right anterior portion. 

 Epinotum black, with the exception of the outer portion of the left spine, a thin 

 streak on right spine and the right half of the space between the spines, which are 

 yellow. The right spine is longer than the left. Petiole black with the exception 

 of a yellow circular patch on left anterior corner and another on right posterior 

 corner ; post-petiole, left half yellow, riglit half black. Wings intermediate 

 between ^ and ? . Legs intermediate, partly black, partly yellow. 



Gaster blackish, with indistinct yellow patches, with four visible segments 

 above, and «r genitalia considerably excertcd at apex. Long. Gbmm. (including 

 (? genitalia G-Smm.). 



in 11)03, Wheeler [Bull. Amer. Mus. N.Il., 19, G58-683 (1903) j 

 described and recorded all the known cases of gynandromorphic ants. 

 These are : — 



1. Formica san<minea, Latr. (Tischbein, 1851). 



