124 



[MaT, 



ner. Subsequent examination showed it to be a monstrosity of the 

 above named species ; the right half of the body exhibiting characters 

 strongly characteristic of the (J, while the left half resembles the ?. 



The following is a description of the two halves, drawn up in 

 parallel columns for comparison. 

 Left Half. 

 Head red, with darker cloud reaching 

 from vertex to eye. 



Mandible very large, with 7 teeth. 



Eight Half. 

 Head dark brown. 



Mandible small (the ant being carded 

 I cannot clearly make out the form of 

 the right mandible). 



Antenna 13-jointed, dark, thin, with 

 pale hairs ; Ist joint of flagellum stouter 

 than next, but subequal to it ; the fol- 

 lowing joints all much longer than wide ; 

 apical joint as long as on left side, but 

 not nearly so stout ; scape short and 

 straight, only about as long as two 

 joints of flagellum, and per se barely half 

 the length of that of left side. 



Eye larger ; more than twice the size 

 of the other, and much nearer to the 

 base of antenna. 



Mesothorax dark, laterally with two 

 rough projections, apparently tegula. 



Second node of petiole darker. 



Abdomen from middle line dark 

 brown. 



Legs longer and thinner. 

 The form of the abdomen, so far as I can make out in this speci- 

 men (set on card) is that of the ? . The shape of the mesothorax is 

 unsymmetrical bilaterally. Length, about 3 mm. 



DESCRIPTION OP FIGURES. 

 A, right, B, left, antenna, viewed from the side (enlarged). 



In the " Entomologist's Annual," 1874, F. Smith describes an 

 anomalous specimen of Myrmica Jcevinodis, having the right side en- 

 tirely ?, but the left side partly $, partly ? ; while in my Stenamma 

 the right side is c? , the left 5 . lam indebted to Mr. Saunders for the 

 reference to the Annual. 



Sopworth Rectory, Chippenham : 

 3£arch, 1891. 



Antenna 12-jointed, testaceous, with 

 pale hairs ; 1st joint of flagellum longer 

 than next two together ; these and the 

 following joints much wider than long ; 

 apical joint very large and stout, as long 

 as two preceding ; scape very long and 

 bent, as long as many joints of flagellum. 



Eye small. 



Mesothorax red. 



Second node of petiole lighter. 



Abdomen from middle line testaceous- 

 brown. 



Legs shorter and thicker. 



