22 ENTOMOLOGICAL SOCIETY 



It is this character which induces me to place the Acanthos- 

 tichinse in this family rather than in the family Poneridse, al 

 though otherwise, especially in the workers, they are apparently 

 just as closely allied to that family, where Forel and Emery 

 now place them. 



The first species discovered, however, was a worker and 

 that was originally placed by Frederick Smith, of the British 

 Museum, in the Dorylid genus Typhlopone Westwood. Dr. 

 Gustav Mayr made Typhlopone serratula Smith the type of 

 his genus Acanthostichus, which is now known in all three 

 sexes, the female having been described and figured recently 

 by Professor Emery, who also at one time classified the genus 

 with the subfamily Dorylinse. 



The three subfamilies may be recognized from the structural 

 characters made use of in the following table : 



TABLE OF SUBFAMILIES. 



1. Workers 2 



Females 5 



Males 12 



2. Abdominal petiole composed of only one joint 4 



Abdominal petiole composed of two joints 3 



3. Antennae 9 to lo-jointed Subfamily I. ECITONIN./E 



4. Antennae 9 to 12-jointed. 



Pygidinm normal, the apical margin not armed with a row of 

 fine teeth Subfamily II. DORYLIN^: 



Pygidium abnormal, the apical margin armed with a row of fine 

 teeth Subfamily III. ACANTHOSTICHIN^: 



5. Wingless forms 6 



Winged forms 1 1 



6. Head without either eyes or ocelli 7 



Head with the eyes present, represented by a single ocellus, at or 



near the lateral middle 8 



7. Head not distinctly bilobed ; thorax with only the pronotal suture 



present, the mesonotal suture absent. . .Subfamily I. ECITONIN^E 



Head distinctly bilobed; thorax with the pro- and meso-notal sutures 



distinct Subfamily II. DORYLIN^: 



8. Pygidium normal, unarmed 9 



Pygidium abnormal, the apical margin armed with a row of minute 



teeth 10 



9. Meso-metanotal suture absent, the meso- and meta-notum closely 



united, the pronotal suture indistinct. . .Subfamily I. ECITONIN^: 

 Meso-metanotal suture distinct, the meso- and meta-notum sepa 

 rated, the pronotal suture distinct Subfamily II. DORYLIN.E 



