LACEBUG GENUS ACALYPTA — DRAKE AND LATTIN 333 



three sternal divisions, open at base. Labium long, 4-segmented, 

 extending to middle of or slightly beyond metasternum. Antennae 

 long, slender; segment I short, stout, slightly longer and stouter than 

 11; III longest, slenderest; IV moderately long, fusiform to subclavate. 



Pronotum. — Subdepressed, punctate, unicarinate (pis. 3-6) or 

 tricarinate (pis. 7-15); collar tectiformily raised at middle, produced 

 forward over base of vertex; calli small, impunctate; median carina 

 percurrent on hood and pronotmn, ridgelike and without cells on 

 hood, foliaceous and uniseriate on pronotum; lateral carinae cus- 

 tomarily slightly lower than median carina, frequently raised 

 anteriorly, composed of one row of areolae, either parallel or slightly 

 divergent posteriorly; paranotum explanate, long, subrectangular, 

 slightly reflexed, two or tkree areolae deep in front, only one or two 

 wide opposite humeral angle; posterior process triangular, areolate. 

 Legs moderately long, femora slightly swollen, tarsi 2-segmented. 



Elytra. — Abruptly widened at base to that of pronotal width 

 across paranota, slightly longer than and thus covering abdomen, 

 with inner margins connivent, apices rounded and separated from each 

 other; claval area not clearly defined, concealed beneath backward 

 projection of pronotum; major divisions of costal, subcostal, discoidal, 

 and sutural areas sharply defined by boundary veins from one another 

 (pi. 1a); sutural area much reduced, narrow. Metathoracic wings 

 obsolete. Hypocostal lamina (pi. If) of elytron either composed of 

 one complete row of areolae or slightly wider and biseriate in basal 

 third to half. 



Abdomen. — Segmentation, spiracles, male and female genital 

 segments as figured and labeled in plate 1. 



Macropterous form.^ — Oblong. Pronotum swoUen, convex across 

 humeral angles, coarsely punctate. Anterior pair of coxal cavities 

 more distant longitudinally from middle pair than in brachyptery. 

 Elytra (pis. 1, 12) long, much longer as well as wider than abdomen, 

 the sutural areas large, overlapping each other in repose so that their 

 apices lie jointly rounded at rest; claval area (pi. 1) small, sharply 

 defined, always concealed beneath backward projection of pronotum 

 in resting position; costal, subcostal, discoidal, and sutural areas 

 separated from one another by prominent boundary veins; 

 metathoracic wings large, functional. Venation of elytron (pi. Id) 

 and hind wing (pi. IE) as labeled in the illustrations. Other structures 

 similar to those in brachypterous form. 



Certain structural characters, which usually remain fairly constant 

 in most tingid genera, vary considerably between the pterygopoly- 

 morphic forms within a species. These dimorphic differences include 

 such features as: size and convexity of pronotum, spacing longitudinally 

 of coxal cavities, form and length of elytra, absence or presence of 



