By Richard Bohart and Lionel Stange
Read or Download A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae) PDF
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Extra info for A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae)
Length to apex of tergite II from 18 to 21 mm. Black with yellowish orange as follows: mandible, antenna, ocular spot, anterior and mesal margin of pronotum, tegula, parategula, wings, and legs partly. N otum and mesopleuron with abundant hair; basitarsus of female foreleg with numerous small, reddish, peglike spines on outside face. Vertex closely micropunctate, frons striatopunctate and polished in female, punctate with few scattred micropunctures in male; postocular area sparsely punctate, polished; frons with small longitudinal groove or depression above interantennal area; pranotum closely punctate, subhumeral area mostly micropunctate below; scutum closely punctate (male) or striatopunctate (female) sublaterally and anteriorly, mesopleuron moderately to closely punctate at least above; scutellum with weak longitudinal channel, striatopunctate (female) or punctate (male) on anterior threefourths; posterior face of propodeum striatogranulate, lateral carina irregular, not sharp, present for at least one-half of distance from spiracle to apical lamella; petiole dorsally with scattered small punctures and obscure shagreening.
Mesopleuron with thick pubescence (female) or fine pale hair (male) ; head and natum 'without erect hair in female, short and moderate hair in male. Interantennal area of female with a strongly raised longitudinal ridge; scutum with scattered macropunctures and moderate micropunctures, mesopleuron sparsely punctate. Male antenna with reddish calli on :flagellomeres VII-IX, antennal hook (fig. 14) ; male mandible with nearly even biting edge, male clypeus bidentate apically; fore hasitarsus of male strongly compressed laterally, twisted, in thin side vie-w more than twice as broad apically as basally; pronotum rounded between humerus and tegula, latter definitely bent outward at posterior one-third in usually less so in female; sternite II nearly fiat, tergite II hardly raised at base of distal lamella ; male gemtalia (figs.
Area can be rather sharply dra'Wll as compared with its southern limits. that have reached northern outposts on the Pacific side include Z. menkei, guerreroi, nigricornis, and aztecus. The southern boundary is crossed by at least eight species but nineteen others do not occur south of Nicaragua, and three South American forms, Z. cerceroides, costarricensis, and pygmaeus, range north only to Guatemala. Seven other species extend northward only to Costa Rica. Taking these figures into account along with topography, \ve have drawn the boundary line belo\v Lake Nicaragua.
A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae) by Richard Bohart and Lionel Stange