MmicJiester Memoirs, Vol. xliii. (1899), No. 0. 3 



The only record we have of the natural history of 

 Trigonalys is a note by Smith {Trans. Entoni. Soc, i. 

 (n.s.), p. 176), who states that he found a species in the 

 nest of a Polistes. In connection with that observation, 

 it is worthy of note that many of the species described 

 have a considerable resemblance to wasps, while the 

 species I now describe has a great resemblance to a bee, 

 as has also Nornadina. 



LlABA, gen. nov. 



Antennae not much longer than the head and thorax 

 united, stout, placed immediately over the clypeus ; the 

 first joint large, cup-shaped ; the second about one-fourth 

 of the length of the first ; the third and fourth joints about 

 equal in length ; the basal joints of the flagellum longer 

 than broad ; the apical broader than long. Head nearly 

 as wide as the mesothorax, not much developed, and 

 obliquely narrowed behind the eyes ; occiput margined. 

 Ocelli not quite forming a triangle. Clypeus small, its 

 apex rounded. Mandibles large, broad, about as broad as 

 long; its outer edge roundly curved, its inner half with 

 three large, sharply triangular teeth. Eyes parallel, large, 

 curved on the inner side, and distant from the base of the 

 mandibles. Palpi apparently minute. Thorax of normal 

 form ; the parapsidal furrows deep, complete ; scutellum 

 not much raised ; metathorax with a gradually rounded 

 slope. Legs of moderate size ; the trochanters with two 

 joints ; the tarsi stout ; the patellae distinctly developed ; 

 the claws bifid, minute. Wings with one radial and three 

 cubital cellules ; the radial cellule not reaching to the apex 

 of the wing ; the first cubital cellule is longer than the 

 second ; the third is the longest of the three ; the cubital 

 nervure issues from the transverse basal ; the first recur- 

 rent nervure is received in the first cubital cellule, near the 



