18 U.S. NATIONAL MUSEUM BULLETIN 2 43 



Head very short, little produced in front of compound eyes, sharply declivent; 

 antennal segment I surpassing by most of its length the apex of clypeus (pis. 



9»39) 2 



2. All tarsi slender, segment II at most only slightly swollen (pis. 9, 29). 



Tingini Laporte (p. 42) 



All tarsi greatly swollen; segment II enormously swollen, nearly ovate in outline, 



upper surface convex, beneath deeply concave, the concavity filled with short, 



bristlelike hairs (pis. 7, 8) Litadeini, new tribe (p. 42) 



The vianaidines are indigenous in the Neotropical region and known 

 only from there. Four species are described, all being found inside the 

 subterranean nests and underground passageways of ants. As to the 

 natural history and relation between the vianaidines and ants, very littie 

 is known. All species are myrmecophiles with obsolete ommatidia, and 

 perhaps blind. The ostiole and ostiolar canal are very prominent and 

 provided with an extremely large evaporatorium (pi. 56). 



Key to Genera and Species of Vianaidinae 



1. Broadly ovate, widest behind middle of elytra, there width about two-thirds 



that of median length; paranotum and costal area wide, equally explanate, 

 each with large rounded punctures, base of pronotum and elytron distinctly 

 punctate; hypocostal lamina wide, obtusely angulately widened near base, 

 there biseriate, thence posteriorly uniseriate (pi. 53). 



Thaumamannia manni Drake and Davis (p. 444) 

 Elongate-ovate, elytra at widest point less than half the median length; parano- 

 tum and costal area absent; posterior part of pronotum and elytron distinctly 

 punctate; hypocostal lamina very narrow (usually mistaken for costal area), 

 composed of one row of tiny punctures 2 



2. Backward branch of the vertical ostiolar canal situated only slightly above the 



hind acetabulum so as to divide the posterior part of the metapleural evapora- 

 torium into unequal divisions (pi. 56). 



Anommatocoris zeteki Drake and Froeschner (p. 444) 



Backward branch of the vertical ostiolar canal placed higher on the metapleural 



evaporatorium so as to divide the evaporatorium into two nearly equal 



divisions 3 



3. Compound eyes with only a small cluster of poorly developed ommatidia; 



elytron finely punctate for most of its length, shortly pubescent (pi. 55). 



Anommatocoris coleopteratus (Kormilev) (p. 444) 



Compound eyes with a few scattered, almost obsolete ommatidia; elytron 



punctate on basal part, thence posteriorly impunctate, inconspicuously 



pubescent (pi. 54) Anommatocoris rninutissimns China (p. 444) 



In this catalog an attempt has been made to record the scientific names 

 and technical literature published on lacebugs since the beginning of 

 systematic entomology, which dates from the publication of Linnaeus' 

 Systema Naturae, 10th edition, 1758. 



