174 Rev. T. A. Marshall's monograph of 



thorax ; 1st segment twice longer than broad, hardly widened 

 posteriorly, finely margined, punctato-rugose ; tubercles incon- 

 spicuous. Terebra straight, half as long as the abdomen, or some- 

 what less. (^ antennae hardly shorter than the body, subsetaceous, 

 fuscous, 19-jointed, the basal joint rufous at the apex. Praediscoidal 

 areolet as in the 2 . First abdominal segment linear ; anal forceps 

 somewhat exti'uded. Length, 1^^ ; wings, '2i- lin. 



Very like humilis, Nees, but larger and stouter, with 

 longer antennee ; the dentiform angles of the meta- 

 thorax, though short, are never quite obsolete ; the 

 radius is not quite straight, and its areolet shorter in 

 proportion. It is, however, extremely difficult to dis- 

 tinguish otherwise than by the size. Gregarious, and 

 abundant throughout the country in shady woods. 



9. Blacus aptenodytes, n. s. 



5 . Niger, prothoracis lateribus, mesonoto, scutello, rufis ; " 

 abdominis segmento 3tio pedibusque cum coxis testaceis ; ungui- 

 culis fuscis. Antennae corpore paulo breviores, 18-articulatse, rufo- 

 testace^e, scapo et articulo ultimo obscurioribus ; flagelli articulus 

 lus 2o duplo longior ; ultimus oblongus, acuminatus, e duobus 

 conflatus, praecedente duplo longior. Corpus subtiliter albido 

 pubescens ; caput, mesothorax, scutellum, sicut in B. ruficorni 

 formata ; metathorax deplanatus, rugulosus, medio carinatus, 

 areis dorsalibus duabus distinctis; postice fere in perpendiculum 

 declivis, angulis fortiter productis, obtuse dentiformibus. Alae 

 angustissimas (latitudine vix nisi longitudinis sextantem a;quante), 

 abbreviatae, ciliatae, metathoracis apicem non excedentes ; stigma 

 lineare, alae apici propinquum, et cum nervis fusco-testaceum. 

 Femora postica cum tibiis suis solito crassiora, subclavata. Abdo- 

 men deplanatum, apice compressum ; segmentum lum elongatum, 

 lineare, apicis latitudine circiter triplo longius. bicarinatum, rugu- 

 losum ; caetera laevissima. Terebra breviusci;la, segmenti Imi 

 longitudinem dimidiam hand superans, Mas latet. 



5 . Black ; prothorax at the sides, disk of the mesothorax, and 

 scutellum, rufous ; 3d abdominal segment, and legs together with 

 the coxae, testaceous ; claws fuscous. Antennae rather shorter 

 than the body, 18-jointed, rufo-testaceous, with the scape and the 

 last joint darker ; 1st joint of the flagellum twice as long as the 

 2d ; last joint oblong, acmninate, consisting of 2 joints united, 

 twice as long as the preceding. Body minutely and sparsely 

 pubescent with whitish hairs ; head, mesothorax, and scutellum 

 formed as in B. ritficornis ; metathorax deplanate, rugulose, 



