132 OETHOPTEEA. 



to be discovered. The females of the various species are so closely allied that they 

 can only be separated by small differences in size and in the coloration of the wings ; 

 and they will certainly be confounded if these differences are not pointed out in a com- 

 parative synopsis, including all the kuown species. The males are more variable and 

 still more difficult to determine than the females. 



The first two species have black wings in the females, and they form a special group, 

 having also the anterior femora and coxae maculated on the inner side. The other 

 species with tricoloured wings and immaculate anterior legs form a second group. 



The distribution of the species seems to be very local, each being confined to a 

 limited region. 



Synopsis specierum. 



I. 



1. Femince : 



a. Elytra et alse complete explicata. 



b. Elytra latiuscula, tota coriacea, margine costali arcuato. 



c. Alse totse fuscse, apice macula pallida; elytra stigmate nigro, ultra' medium oblique 

 fusco-bifasciata. Scutellum faciale tripartitum. 

 d. Grisea ; alae haud hyalino-limbatse. — [1. truncata, F.] 

 dd. Flavescens; alas margine apicali hyalino. — [2. westwoodi, sp. n.] 

 cc. Prasinse; elytra tota prasina, stigmate concolore seu nullo. Scutellum faciale 

 transversum, planum. Alse tricolores, campo posteriore fusco, anteriore lateritio : 

 d. et ad apicem rufo, campo posteriore apice vix hyalino-limbato. — [3. concinna, 

 Perty.] 

 dd. minor, alse margine apicali toto hyalino-limbato. — [4. paraensis, sp. n.] 

 bb. Prasinse. Elytra minus lata, apice attenuata, luteo-arcuato-fasciata, margine costali 

 parum arcuato, campo marginali angustiore ; apice et parte distali marginis suturalis 

 partim vitreis. Alse tricolores. 

 c. Elytra stigmate nigro ; alse dimidiatse, antice rufse, postice fuscse, margine apicali 

 et externo latiuscule hyalino. 

 d. Pars rufa alarum basi dilatata, quam pars fusca latior. — 5. mexicana, sp. n. — 

 [6. multicolor, Sss.] 

 dd. Gracilis, minor; alarum pars rufa atigusta, parallela ; campus posterior fere ad 

 basin infuscatus. — 7. fraterna, sp. n. 

 cc. Elytra stigmate concolore ; alae antice rufse, apice et postice vitrese, fascia grandi 

 arcuata fusca. 

 d. Alarum fascia rufa basi vix dilatata ; campus posterior magna parte vitreus ; ejus 

 fascia fusca totum marginem liberans. — [8. cayennensis, sp. n.] 

 dd. Alarum fascia rufa basi retro dilatata ; fascia fusca marginem posticum inclu- 

 dens. — [9. amcenula, Gerst.] 

 aa. Elytra et alse rudimentaria squamiformia. — [13. brevipennis, Sss.] 



