140 [June, 



Cljpeus yellow to middle line ( <J char.). Clvpeus black to middle line ( 7 char.). 



Front tibia jellow above ( c? char.). Front tibia black, with two very minute 



yellow dots (char, of some females 

 which often have the tibia entirely 

 black). 



Middle and hind tibise yellow above Middle and hind tibite with yellow lines 



( c? char.). above, but less yellow than on the 



leftside ((? char., the + always having 

 these parts black). 



CHARACTERS OF STRUCTURE, 



Mandible small, of normal J structure. Mandible very large, of normal *;' struc- 

 ture. 



Antenna 13-jointed, the two terminal Antenna with twelve simple joints, the 



ones much modified to form a hook ; scape one-third longer than on the 



scape short (normal (J antenna). left side (normal ? antenna). 



Front tarsi a little more slender (cJ Front tarsi a little wider (¥ char.). 



ciiar.). 



Abdomen with seven ilorsal segments Sting normal, well developeil ( '+' char.). 



(t? char.). 



The develojjUK'iit of a seventh dorsal segment (the $ having but 

 six) in conjunction with the perfect development of the indrawn $ 

 segments, which form the sting, is a remarkable character. This 

 seventh segment is not fully developed, but is asymmetrical, and 

 pointed, as if cut out of the normal ^J segment ; and it is curious 

 that it is formed as if the left side had been cut away, since it is the 

 left half of the insect which exhibits all the (^ structural characters. 

 Of the (^ indrawn segments forming the genital armature there was 

 no trace at all, nor yet of the testes, vesiculte, or ducts, 'i'he ovaries, 

 if present at all, were much less developed than is usual in mature 

 Hi/iiienojjtera, as I failed to iind these, but the poison gland was ab- 

 normally largely developed. Owing to the fact that the specimen 

 had been dead two days before it was examined, the study of the soft 

 parts was difficult and unsatisfactory. Hermaphrodite Aculeates are 

 certainly very rarely met with. During the past fifteen years I have 

 caught and examined not less than 20,000 examples of this group, 

 but only once previously met with an instance, the hermaj)hrodite 

 ant, >Sfe?iamma Wcstwoodi, described by me in this Magazine (Ent. Mo. 

 Mag., xxvii, p. 123). 



Honolulu, H. 1. : 



February, 19U1. 



