168 INSECUTOR INSCITI^ MENSTRUUS 



fourth, the basal fourth white scaled all round. Palpi short, 

 white scaled. 



Genitalia. Side pieces twice as long as wide, a slight lobe 

 present covered with minute hairs and small setae. Clasp fila- 

 ment with three lobes arising from a very short stem, the mid 

 lobe somewhat larger than the lateral ones ; mid lobe ex- 

 panded subapically, strongly tapered toward apex, tip slender, 

 an incision going down for one-third of the length of the lobe ; 

 one margin with a row of setae ; below expanded portion there 

 are two appendages, one small slender straight, the other one 

 with short slender stem and much expanded apical part ; one 

 lateral lobe agrees in shape with the mid lobe, but is not so 

 sharply pointed and is without appendages ; the other lateral 

 lobe is more quadrately elongate, one tip of outer margin 

 broadly expanded, with a few short spines, other tip thumb- 

 shaped, with a sharp spine, a few more spines present on mar- 

 gins. Harpes broad, with curved toothed tip. One uncal 

 plate small slender, one plate slender long, serrate on one 

 margin, one plate long curved at tip. Each basal appendage 

 with two rather short spines at tip. 



Larva. Head-hairs in twos, ante-antennal hairs multiple. 

 Comb of eighth segment of 18 spines in a single row, air-tube 

 five times as long as wide, false pecten all over the tube ex- 

 cept at base. Many small two- and three-haired tufts on the 

 tube. 



Larvae found in Bromeliaceae, Lawa River, March, 1917. 



Cotype, No. 22700, U. S. National Museum. 



Hystatomyia lamellata, new species. 



Male. Proboscis moderate, swollen apically. Palpi short. 

 Clypeus nude. Occiput clothed with flat, dark scales, a margin 

 of white scales around the eyes and a few milky white ones 

 near the median line. Prothoracic lobes dark, the tips cop- 

 pery-white. Mesonotum dark brown, with bronzy and blue 

 reflection. Scutellum trilobate with vestiture similar to meso- 

 notum. Postnotum without scales, with a group of hairs. 

 Abdomen compressed, the colors separated in a straight line. 

 Wings hyaline, scales of veins narrowly ovate. Legs black, 



