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and very minute setae. Mesosome a sclero- 
tized, truncated cone, tip slightly rounded, 
subbasally with some long filamentous setae, 
which are characteristic for this species. Tenth 
sternites elongate and partially sclerotized, 
showing a beak-like process in distal margin, 
very strongly sclerotized; some minute fila- 
ments arising from prominences on inner 
portion. Ninth tergites sclerotized, forming 
2 lobes with 5 long sclerotized filaments at 
the tip and 1 in the middle, 
TYPE locality: Guayaquil, Ecuador, as 
given by Dyar in his original description, this 
being the same locality where specimens 
which I have studied were collected. The 
species has been confused by many authors 
under the name A. eupoclamus Dyar and Knab, 
but has many characters that are unlike those 
of this Costa Rican and Central American 
species. I believe, therefore, that it should be 
placed as a valid species, not as a synonym of 
eupoclamus. In my opinion, A. (0.) eupoclamus 
has never existed in Ecuador or any other 
country of the Pacific coast of South America. 
REFERENCES 
Dyar, H. G. 1918. New American mos- 
quitoes. Insecutor Inscitiae Menstruus 6 (7-9) : 
120-129. 
1925. Some mosquitoes from Ecuador. 
Insecutor Inscitiae Menstruus 13: 27-31. 
■ — - 1928. The mosquitoes of the Ameri- 
cas. Carnegie Inst. Wash.., Pub. 387: 167. 
and F. Knab. 1906. The larvae of 
Culicidae classified as independent organ- 
isms. N. Y. Ent. Soc.,Jour. 14: 169-230. 
Edwards, F. W. 1932. Family Culicidae. 
Genera Insectorum. Fasc. 194: 142. 
Howard, L. O., H. G. Dyar, and F. Knab. 
1917. The mosquitoes of North and Central 
America and the West Indies. Carnegie Inst. 
Wash., Pub. 159 (4): 525-1064. 
