MORGAN HEBARD 



353 



Measurements {in millimeters) 



5^ II ^1 ia 21 



^ «^ ^1 2| ^1 ^1 



Vera Cruz, Mexico 18.8 4.8 5.9 19.7 5.4 



Atoyac, Mexico 14.7 3.8 4.7 17 4.9 



La Palma, Costa Rica 13.5 3.7 4.6 16.7 4.6 



Juan Viiias, Costa Rica 17.7 4.7 5.6 19.1 5.4 



San Jose, Costa Rica 14.1 4 4.8 16.5 4.7 



Monte Redondo, Costa Rica .. . 13.4 3.8 4.8 14.8 4.3 



Monte Redondo, Costa Rica .. . 18.2 4.2 5.3 20.4 5.8 



P6zo Azul, Costa Rica 18.9 4.8 6 19.4 5.8 



9 



Gulf Coast of Texas 15.2 4.3 5.5 14.8 4.7 



Atoyac, Mexico 21.5 4.8 6 17.7 5.5 



Orizaba, Mexico 16.5 4 4.8 14.8 4.7 



Benque Viejo, British Honduras 21 5.2 6.7 20 5.7 



Juan Vinas, Costa Rica 17 4.8 5.8 20.6 5.1 



San Jose, Costa Rica 17.9 5 6.1 12.3 4.8 



P6zo Aziil, Costa Rica 19.3 4.9 6 20.4 5.7 



Costa Rica 14.6 4.5 5.3 12.2 4.5 



The decided size differences in the present race appear to rep- 

 resent responses to local environmental conditions, these found 

 particularly in regions of decided diversity in elevation. The 

 very large and richly colored specimens from Juan Vinas and 

 particularly Pozo Aziil, Costa Rica, represent almost certainly 

 the response to rich upland jungle conditions. Tegminal reduc- 

 tion apparently occurs at higher altitudes (see rufa debilis). 



That more than one type is found at the same locality, though 

 probably in distinctly different local environment, is shown by 

 the decided differences found in the two males from INIonte Re- 

 dondo, Costa Rica, at which place and at Azahar de Cartago, 

 Costa Rica, both this race and ruja dehilis have been secured. 

 Very large series from the mountainous sections of the race's 

 distribution will be needed, accompanied by local environmental 

 data, before the causes and exact significance of such diversity 

 can be definitely ascertained. 



Coloration. — Normally very close to typical rufa though fre- 

 quently of a slightly darker shade, but with head entirely pale 

 (usual) or entirely dark (often in dark individuals) and very 

 rarely with the area from occiput to just below the ocelli con- 



TRANS. AiM. ENT. SOC, XLII. 

 2 



