MUTILLA. INSECTS. 345 



small galleries at the level of the ground which lead to its habi- 

 tation Lat. Hist. Fourm. 156. 



The males and females of this species appear in the month of August in great 

 numbers. 



TRIBE II. MUTILLARLE, Lat. 



Species composed of two individuals, males and females, the fe- 

 males apterous ; antennae filiform or setaceous, with the first 

 and third joint elongated ; feet of the females strong, with 

 the legs spinous and ciliated. 



I. Antennae inserted near the mouth ; abdomen cylindrical, with the first segment 

 cither separated from the following by a transverse incision, and rounded above, 

 or almost in the form of a saddle ; one or two cubital cells ; no second recurrent 

 nerve. 



Gen. DORYLUS, LABIDUS. 



II. Antennae inserted near the middle of the anterior face of the head ; abdomen 

 either conical or ovoid ; first segment sometimes globular ; three cubital areolae 

 with the nerves recurrent in- some, but wanting in others. 



1. Two first abdominal segments in the form of knots ; no cubital areolte, one ra- 

 dial. 



Gen. APTEROGYNA. 



2. The first abdominal segment in the form of a knot; three cubital areolae, with 

 recurrent nerves. 



A. Maxillary palpi as long at least as the jaws ; second joint of the antennae disco- 

 vered, not received into the first. 



a. Thorax of the females continuous, almost cubical. 



Gen. MUTILLA, PSAMMOTHERMA, (antennas of the males pectinated.) 



b. Thorax either knotty, as if jointed, or divided by sutures. 



Gen. MYRMOSA, SCLERODERMUS, METHOCA. 



B. Maxillary palpi much shorter than the jaws ; second joint of the antennae re- 

 ceived into the first and concealed. 



Gen. MYKMECODES. Thorax cubical, divided in three by two transverse sutures. 



Gen. MUTILLA, Lat. 



Abdomen in both sexes ovoid and convex, the first segment nar- 

 rowest, the second large and rounded ; thorax of the fe- 

 males cubical, without knots or divisions ; antennae filiform 

 and vibratile, half the length of the body, with the first joint 

 elongated, cylindrical, and bent ; mandibles of various forms, 

 according to the species, but in general strong, arched, and 

 pointed ; maxillary palpi longer than the labial, of six un- 

 equal joints, the labial with four. 



The males in this genus are apterous, with eyes composed of three smaller ones, 

 while the eyes of the females are round, oval, or entire, and the sexes are besides 

 often of different colours. The manners of the group are little known. They are 

 found in sandy places, where they run with agility, under stones, or upon flowers. 

 The females have a sting concealed in the abdomen, with which they prick severely 

 when taken. 



M. Europea, Lat. Lin. Head black ; thorax red, slightly blackish 

 anteriorly ; abdomen black, with the base and border of the rings 

 clear white. Inhabits Europe. Shaw, vi. pi. 101. 



