46 University of Michigan 



tips and occasionally on leaf edges with the hody horizontal or 

 slightly hanging (not hanging like alienum), wings half- 

 spread; always in shade." And at Cristalina: "Alales of 

 this species and erythrogastrum in the afternoon come out 

 from the jungle to open places along the creek, and from 

 some advantageous perch catch their prey like fly-catchers, 

 returning again and again to the same resting place. Males 

 of the same species frequently fight, dancing rapidly and 

 pugnaciously, heads on, before each otlier. Females of both 

 species oviposit unattended by the males." As the males of mi- 

 tratiim fight each other, the only part of the insect visible to the 

 observer may be the brilliant metallic areas on the vertex, 

 which, even in the scanty light of late afternoon, flash like 

 minute golden flames against the green of the jungle, turn- 

 ing and darting here and there, and disappearing to flash 

 again. The same little head-light, more often than anything 

 else, betrays the resting insect to the collector. Though I 

 noted that the female oviposits unattended by the male, I un- 

 fortunately failed to record the place of oviposition, and I 

 have no recollection of the matter. The black posterior vertex 

 of the male with its two anterior prongs or angles makes the 

 specific name appropriate. 



One female specimen has the head of a bee firmly attached 

 to the tarsus of the right front leg. Through the kindness of 

 Mr. Currie, this head was identified by ^Ir. J. C. Crawford 

 as a Trigona. I have previously recorded^- a similar occur- 

 rence in Archueogomphus hamatns. 



A male of mitratum was sent to Dr. Ris who wrote : "Sim- 

 ilar to what I have considered H. acqitatoriale but specifically 

 distinct without question; unkown to me." 



^'11, A New Species of Agriogomphus (Odonata), Occ. Papers, Mus. ot Zool., 

 Univ. of Mich., No. 59, p. 16. 



