INSECUTOR INSCITI^ MENSTRUUS 47 



Type, male, No. 23942, U. S. Nat. Mus. ; Jackson Barracks, ' 

 New Orleans, Louisiana, October 16, 1920 (Colonel C. C. 

 Robbins, Medical Corps, U. S. Army). 



It is possible that this single male may have been transported 

 on a fruit steamer from Bluefields, Nicaragua. It is not allied 

 to any known North American form, belonging to a subgenus 

 found in the American tropics. 



The following table will separate the described species of 

 Melanoconion on the characters of the male hypopygium. 



Subgenus MELANOCONION Theobald 



Melanoconion Theobald, Mon. Culic, iii, 238, 1903. 

 Gnophodeomyia Theobald, Journ. Econ. Biol., i, 21, 1905. 



1. Outer division of lobe of side-piece with a small leaf and several 



setae 2 



This part with a large ribbed leaf and not more than one ap- 

 pendage 3 



2. Inner division of lobe of side piece with a short spine at tip and 



smaller one on the side atratus Theobald 



This part with two long sinuate filaments, homoeopas Dyar & Ludlow 



3. Inner division of lobe of side piece with four appendages 4 



This part with two appendages 5 



4. A short stemmed scale bej^ond lobe of side-piece. ..'^/'/^-f//'^^ Theobald 

 Without this structure dnnni Dyar 



5. Leaf stemmed, with one large appendage aikenii Aiken 



Leaf sessile, the appendage setaf orm 6 



6. Inner division of lobe of side piece with two large appendages, 



zeteci Dyar 

 This part with one large and one setaf orm appendage 7 



7. Side-piece narrowed outwardly ; a large stemmed scale inserted 



beyond the lobe comrnevyncnsis Bonne-Wepster & Bonne 



Side-piece conical ; no stemmed scale, 



ensiformis Bonne-Wepster & Bonne 



Culex (Choeroporpa) dysmathes, new species. 



Female. Head very dark brown or black, clothed with very 

 narrow dark brown and golden brown or ochraceous curved 

 scales, black forked scales, and greyish-white flat scales. The 

 dark curved scales cover the median third of the head, extend- 

 ing to the vertex ; the black forked scales are scattered around 

 this area ; the greyish white flat scales are laterad, and, becom- 



