﻿SAWFLIES FROM PANAMA, WITH DESCRIPTIONS OF 



NEW GENERA AND SPECIES x 



By S. A. ROHWER 



The following report of the Chalastogastra (sawflies) collected 

 by Mr. August Busck on the Smithsonian Biological Survey of the 

 Panama Canal Zone in the year 191 1, has been prepared in the 

 Branch of Forest Insects of the Bureau of Entomology, U. S. 

 Department of Agriculture. Although the collection made by Mr. 

 Busck is small there are some interesting species, Acorduloceridea 

 compressicornis being the most remarkable one of the lot. Ptilia 

 laiitif ormis and Stromboceridea maculipennis are nearly identical 

 in color, yet belong to widely separated families. This identity in 

 coloration in the Neotropical region is often repeated in well separated 

 groups of Chalastogastra ; and often a number of species of one 

 genus may be colored almost the same. As a rule the Neotropical 

 sawflies are quite different both in color and structure from the 

 Nearctic, and in some subfamilies resemble more closely the species 

 of the Oriental region than any other. It would seem, in the 

 Selandriinse, that the species of the Neotropical and Oriental regions 

 have developed along the same lines, perhaps due to the southern 

 extension of the Holarctic types into a warm region. 



CALOPTILIA NIGROSTOMA, new species 

 Differs from Caloptilia nigriceps (Cameron) and C. nubeculosa 

 (Konow) (C. vitreata Konow is probably the male) by the black 

 mouth as well as other characters. 



Female. — Length 7.5 mm. Lab rum depressed apically, the anterior 

 margin broadly rounded ; apical margin of the clypeus depressed ; 

 transverse clypeal carina triangulate ; median carina strong ; middle 

 fovea triangular in outline, dorsal wall rounded ; ocellar basin pen- 

 tagonal ; antennal foveae very large, extending up to the level of an- 

 terior ocellus ; postocellar area about twice as wide as long, poorly 

 defined ; stigma scarcely tapering, nearly parallel-sided ; sheath 

 straight above, broad at base, arcuately emarginate below, apex 



x The present paper is the tenth dealing with the results of the Smithsonian 

 Biological Survey of the Panama Canal Zone. 



Smithsonian Miscellaneous Collections, Vol. 59, No. 12 



