Gen. 5. OPISTHEMEGA.[1]
Segmenta podophora 21. Ocelli nulli. Labium plerumque dentatum. Scutum postremum maximum, quadratum, alteris multo majore; pedes postremi crassi, breves. Appendices anales laterales obtusæ. (Figs. 8, 9, 10.)
Feet-bearing segments 21. Eyes absent. Labium generally dentate. Last scutum very large, quadrate, much larger than the others; last pair of feet thick, short. Lateral anal appendages obtuse.
O. postica.
Fig. 8 Fig. 9
O. aurantiaca; capite polito, punctata; segmento basali depressione triangulari mediana; labio antice elongato, mandibulisque punctatis; laminis dentalibus subelongatis, margine antico fere recto; denticulis 6, distinctis, acutis; antennis baud pubescentibus, 17 articulatis; scutis sternisque politis; scuto postremo subprofunde punctato, postice abrupte truncato, medio canaliculato, lateribus rotundatis, marginibus lateralibus valde elevatis; pedibus postremis brevissimis, subprofunde punctatis, subcylindricis; articulis basali tibialique sine spinis, supra subcomplanatis, intus complanatis, margine interiore superiore acuto, alteris rotundatis; appendicibus analibus lateralibus angustis, dense profunde punctatis, postice abrupte truncatis, sine spinis; squama preanali elongata, media vix canaliculata.
Orange; head polished, punctate; basal segment with a median triangular depression; labium anteriorly elongate, together with the mandibles punctate; dental lamina somewhat elongate, anterior margin almost straight; denticules 6, distinct, acute; antennæ not pubescent, 17 articulate; scuta and sterna polished; last scutum subprofoundly punctate, posteriorly abruptly truncate, medianly canaliculate, with the sides rounded, lateral margins very elongate; last pair of feet very short, subprofoundly punctate, subcylindrical; basal and tibial joints without spines, above subcomplanate, within complanate, superior interior margin acute, the others rounded; lateral anal appendages narrow, densely profoundly punctate, posteriorly abruptly truncate, without spines; preanal scale elongate, medianly scarcely canaliculate.
O. postica, Wood, Journ. A. N. S., new series, 1863, vol. v, p. 35.
From the triangular depression on the basilar segment two sutures diverge posteriorly. The scuto-episcutal sutures are very distinct, the sterno-episternal wanting. The sterna are, however, provided with a mesial marking, the line of coalescence of the two primitive sterna. The last pair of feet are rather shorter than in the following species, more cylindrical and smoother, especially on their inner surface. The basal joint is rather shorter than the tibial, which is about twice as long as the tarsal. Can this be the same species as Cryptops postica, Say? It agrees with Mr. Newport's description of his Thea-
- ↑ Wood, Journ. A. N. S., new series, 1863, vol. v, p. 35. Οπισbε, postice, μεγας.
vol. xiii.—22
