Colocistis castanea (Cresson)

Kimsey, Lynn S. & Wasbauer, Marius S., 2013, Revision of the brachycistidine genus Colocistis Krombein, 1942 (Hymenoptera, Tiphiidae), Journal of Hymenoptera Research 33, pp. 1-24 : 6-7

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Colocistis castanea (Cresson)


Colocistis castanea (Cresson) Figures 2, 9 View Figures 1–12 , 14, 15, 17, 20 View Figures 13–24 , 34 View Figures 33–36 , 42 View Figures 41–48 , 50 View Figures 49–56

Brachycistis castanea Cresson, 1865a: 388. Holotype male; USA: California (ANSP).

Brachycistis stygia Bradley, 1917:276. Holotype male; USA: Arizona, Nogales (CUIC). New synonymy.


The simple second metasomal sternum distinguishes Colocistis castanea , Colocistis oaxacana and Colocistis thermarum from other species of Colocistis . Colocistis castanea and Colocistis oaxacana share a flattened clypeus in profile (elevated and tuberculate in Colocistis thermarum ). The concolorous body color and unmodified vertex will distinguish Colocistis castanea from Colocistis oaxacana . No structural features, only color could be found to distinguish Colocistis stygia from Colocistis castanea .



Body length. 10-15 mm.

Head ( Fig. 2 View Figures 1–12 ). Head: compound eyes enlarged, extending laterally far beyond temples, inner margins somewhat emarginated; ocelli enlarged, diameter of lateral ocellus at least 0.7 × OOL, removed from vertex by 0.5 or less one ocellar diameter in frontal view; impressed line present between lateral ocelli posteriorly; clypeus nearly flat, not visible above mandibles in lateral view, without projecting tubercle, apex not margined by strong teeth; antennal socket rim only slightly thickened ventrolaterally; LID 0.7 × UID; flagellomere I length 2.3-2.5 × breadth; flagellomere II length 2.5-2.6 × breadth; flagellomere IX length 4.5-5.0 × breadth; occipital carina strong but incomplete ventrally; mandible narrowest submedially, tapering apically toward ventroapical tooth ( Fig. 17 View Figures 13–24 ).

Mesosoma. Pronotal punctures deep, contiguous, shoulders well developed, not produced laterally; forefemur without stout spines; foretibia without spines except apically; basitarsus with row of three spines on outer surface; tibial spur 0.9 × length of basitarsus; hindcoxa with longitudinal carina on ventral surface ( Fig. 15 View Figures 13–24 ), longitudinal dorsal carina not tooth-like; scutal, scutellar and mesopleural punctures large, separated by 1-3 puncture diameters; scutellum elevated above level of propodeum, with polished impunctate area medially; postscutellum densely punctate; propodeum dorsal surface coarsely rugose, with irregular, shallow, longitudinal medial groove, posterior surface separated from dorsal by transverse ridge, posterior surface polished, nearly impunctate, lateral surface dorsally with contiguous punctures becoming sparsely punctate to impunctate ventrally; forewing with 3 submarginal cells; costa continuing along wing margin beyond stigma.

Metasoma. Tergum I without transverse carina ( Fig. 20 View Figures 13–24 ); sternum II without raised area basally.

Genitalia ( Figs 42 View Figures 41–48 , 49 View Figures 49–56 ). Gonostylar apex arcuately excavate in lateral view; aedeagus not decurved before apex.

Color. Head and body concolorous castaneous to black; vestiture light brown.

Female unknown.


( Fig. 34 View Figures 33–36 ). USA: Arizona: Cochise and Pima counties; California: Riverside, San Bernardino counties; Nevada: Clark County; New Mexico: Dona Ana, Eddy counties; Texas: Brewster, Culberson, Dimmit, Hudspeth, Maverick counties; MEXICO: Baja California, Baja California Sur, Chihuahua, Coahuila, Sinaloa, Sonora; 1727 males were examined (BME, CDFA, EMEC, LACM, UCRC).