INSECUTOR INSCITI.'E MENSTRUUS 3 



to Howard, Dyar and Knab (Mosq. No. & Cent. Amer. & W. 

 Ind., iii, 40, 1915). Theobald himself gives the name confusus 

 to this species. One of his confusus specimens bears a type 

 label. This one has no distinct white patches on the sides of 

 the abdomen. It has a very long and slender proboscis with 

 the point scarcely swollen. It is not a Sabethoides imperfectus 

 Bonne-Wepster and Bonne (Ins. I*ns. Mens., vii, 165, 1920). 

 In comparing our material of Sabethoides nitidus from Suri- 

 nam with the material in Washington we found some slight 

 differences between the Central American and South Amer- 

 ican forms. 



Genus SABETHINUS Lutz 

 In the British Museum we found : 



1. One larval preparation labeled Dickson, Trinidad, Sabe- 

 thoides nitidus. This is a Decamyia species. 



2. Another larval preparation labeled Dickson, Trinidad, 

 Sabethoides nitidus. This is like Sabethinus undosus Coquil- 

 lett. There must be some confusion here, because the type of 

 Sabethoides nitidus has a long and slender proboscis, different 

 from a Sabethinus proboscis. 



3. One larval preparation labeled Sabethinus aurescens Lutz, 

 Brazil. This is like Sabethinus identicus Dyar and Knab. 



4. One mount of male genitalia labeled Sabethimis albi- 

 privatus. There is a male in the collection labeled Sabethinus 

 albiprivatus without an abdomen, to which this mount prob- 

 ably belongs. This is recognizable as a Sabethinus with four 

 spines on the basal appendages, two spines on the basal ac- 

 cessory lobes. 



5. One mount of male genitalia labeled Sabethinus inter- 

 medius. There is a male labeled Sabethinus intermedins with- 

 out an abdomen, to which the mount probably belongs. This 

 is recognizable as a Sabethinus with three spines on the basal 

 appendages. 



The following table for the male genitalia results : 



Basal appendages with three spines intermedius Lutz. 



Basal appendages with four spines, 



albiprivatus Theobald ; undosus Coq. 

 Basal appendages with five spines identicus Dyar and Knab. 



