HYMENOPTERA PARASITICA 351 



1. Thorax mostly rufous, sometimes marked with black 7. 



Thorax and abdomen mostly black, the prosternum, mesosternum and meso- 



pleura sometimes pale 2. 



2. Mesopleura, including the pro- and meso-sternum, yellow or pale yellowish, 



rarely dusky on the disk 6. 



Mesopleura with a longitudinal yellow band across the disk, or the mesosternum 



is marked with black 4. 



Mesopleura wholly black 3. 



3. Hind coxae and femora black ; anterior orbits, face below antennae, a spot on 



hind orbits superiorly (sometimes connected with the anterior orbital lines), 

 the cheeks, prothorax, except sometimes superiorly, and the front and middle 

 coxae and trochanters yellow ( 9 ) ; in $ the hind orbits are without a spot, 

 while the prothorax is yellowish only beneath ; antennae, with ring-joint, 



28-jointed ^i) A. flavifrons. 



Hind coxae and femora rufous ; tarsi, or at least the hind tarsi, more or less 

 fuscous, the front and middle pairs sometimes pale ; the face below the 

 antennae, cheeks but not hind orbits, prothorax more or less beneath and 

 the front and middle coxae and trochanters, yellow, or pale yellowish. $ . 



{2) A. tarsattis. 



4. Metathorax not wholly black 5- 



Metathorax wholly black. 



Mandibles, except tips, the orbits, except an interruption at the summit 

 of the eyes, the face below the antennae, prothorax beneath, a longi- 

 tudinal band on the mesopleura and the anterior and middle coxae, 

 lemon-yellow. $ {3) A. citricinctus. 



Mandibles, except teeth, the clypeus, the face below the antennae, the 

 upper anterior orbits and the hind orbits, connected above, the pro- 

 thorax entirel)', a longitudinal band on the mesopleura, and the anterior 

 and middle coxae and trochanters, lemon-yellow. $ . 9 agrees with 

 $ except that the orbits are broadly interrupted above... {4) A. moiokaieiisis. 



5. Metathorax with a large yellow spot on each side towards apex but not 



connected with a yellow band across the base ; mesonotum entirely black ; 

 mesopleura mostly yellow, with a spot beneath the front wings and along 



the mesosternal suture, black, c? {5) A. haleakalae. 



Metathorax with a large yellow spot on each side towards apex but connected 

 with a yellow band across the base ; mesonotum with a hook-like yellow 

 mark on each side anteriorly, the inner angle of same extending as a band 

 towards the scutellum. $ {6) A. hmvaiiensis. 



6. Head, except a spot enclosing the ocelli and the occiput, a hook-like band on 



each side of the mesonotum anteriorly, prothorax, mesopleura, including the 

 mesosternum, except a black spot beneath the insertion of the front wings, 

 a large spot on sides of metathorax connected with a band across the base 



and the scutellum, lemon-yellow. $ (6) A. hawaiic?isis. 



Head black, the face below the antennae (entirely), mandibles, cheeks, front 

 and middle legs, prothorax, mesopleura, including the sternum, except a 

 spot beneath the insertion of front wings and a faint spot on the metapleura, 

 yellow or yellowish-white. $ (7) A. delicatus. 



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