THYESOCEEA. 31 



44. Pronotum posterius trans versum, vix arcuatum. Venae campi discoidalis elytri 

 haud fractae, plus minus furcatae. — Caloblatta, gen. n. 

 33. Antennae setaceae. 



4. Alarum vena ulnaris venas completas ad marginem apicalem, ramosque incompletos 

 ad venam dividentem emittens. Lamina infra-genitalis $ stylis longis munita. 

 5. Antennae crassae. Caput prominulum. Pronotum deplanatum, parabolicum, 

 postice truncatum, subarcuatum. Mares stylo unico (?) instmcti. Cerci 

 mediocres. — [Pseudischnoptera, Sss.] 

 55. Antennae graciles. Vertex modice (rare magis) prominulum. Pronotum 

 utrinque deflexum, postice productum vel arcuatum. Cerci longi; mares 

 stylis 2 instructi. Elytra ? nonnunquam abbreviata. — Ischnoptera, Burm. 

 44. Alarum vena ulnaris ramos incompletos nullos ad venam dividentem emittens. 

 5. Caput parum prominulum. — Blatta, L. 

 55. Caput late prominulum. — Pseudophyllodromia, Burm. 

 22. Elytra cornea ; alae ut in generi Blatta. 



3. Tarsi normales, aroliis instructi. — Ceratinoptera, Br. 

 33. Tarsi aroliis destituti. — Paraceratinoptera, Sss. 

 11. Elytra in utroque sexu abbreviata, abdomen partim liberantia, cornea. 



2. Elytra parum abbreviata. Lamina supra-analis <$ maxima, difformis, in duas partes 

 dissimiles profunde divisa. — Anisopygia, gen. n. 

 22. Elytra truncata vel valde abbreviata, abdomen magna parte liberantia vel rudimentalia. 

 Lamina supra-analis normalis, breviuscula. 

 3. Elytra articulata ; alee minimae. — Temnopteryx, Br. 

 33. Elytra squamiformia, lateralia, haud articulata. Alae nullae. 

 4. Tarsi aroliis instructi, normales. — Loboptera, Br. 

 44. Tarsi aroliis nullis vel minimis, compressis, instructi. — Paraloboptera, Sss. 



THYRSOCEEA, Burm. 



Thyrsocera, Burm., Sauss., Brunn. de W. 

 Pseudomops, Serville. 



This genus is properly American, the species of the eastern hemisphere being 

 rather different in their characters. The American species have the wings destitute of 

 an apical intercalated membranaceous field, and with the ulnar vein bearing 2-3 longi- 

 tudinal branches*. Thyrsocera is strongly represented in Central America. 



* The two types are distinguished as follows : — 



a. Antennae semper plumosae. Alee apice area membranacea intercalata nulla ; campo anteriore venis rectis, 



vena ulnari ramosa. — Thyrsocera, Burm. 



b. Antennae crasse setaceae, tunc plumosae, tunc glabro-pilosellae. Alae apice area membranacea intercalata ; 



campo interiore apice attenuato, vena ulnari arcuata, indivisa vel furcata. (Species orientales.) — Hemi- 

 thyrsocera, Sss. (Th. nigra, communis, major, Br.). 



