Occasional Papers of the Museum of Zoology 17 



tumbo region of Venezuela. The second series occurs east 

 of the Catatumbo region in Venezuela and in Trinidad. In 

 their distribution the two series thus correspond to the two 

 series of H. caja. This paler fauna east of the eastern Cor- 

 dillera is probably correlated with a drier atmosphere than 

 that of the large river valleys to the west. 



The three males from Peru are still more distinct and 

 indicate a departure from the more typical form along the 

 same lines as those of the Santa Marta Mountains form of 

 H. cruentata. These specimens are the largest and richest 

 colored of the entire lot. The character of size is, however, 

 not as striking as in the case of the specimens of H. cruen- 

 tata referred to above. Specimens of H. niacropus of differ- 

 ent sizes occur in each locality where the species is found, 

 and this variation, except in the case of the Peru specimens, 

 seems independent of locality. Specimens from Panama and 

 Trinidad, for example, measure the same (male, abdomen 36, 

 hind wing 25 or 26), and specimens from the Santa Marta 

 Mountains (Cincinnati), Maraquita and Caserio Silva vary 

 from that size up to males with abdomens 40 or 41 and hind 

 wings 27 or 28. The Peru males, however, have the abdomen 

 43 and the hind wing 30, a size not attained by any other 

 specimens before me. 



It has hitherto been difficult or impossible to separate the 

 females of this species from certain females of H. titia. In 

 the female of macropus, at about midlength of the middle 

 lobe of the prothorax, on 'either side just above the suture 

 between the pronotum and the propleuron (that is, about on 

 the level of the lateral extremities of the front and hind lobes 

 of the prothorax), there is a small but distinct outwardly 

 directed antenna-like projection. At the same place on the 

 prothorax of the female of H. titia there is a scarcely discern- 



