8. Hexapoda. VIII. Hymenoptera. 4. Systematik. 333 



Ration, W. H., The American Bembecidae , tribe Stizini. in: Bull, of the U. St. Geolo- 

 logical and Geographical Survey. Washington. Vol. 5. No. 3. Nov. 1879. p. 341 

 -347. 



Enthalt: Sphecius Dhlb. 4 spec.; Megastieus 1 } n. g. 2 spec: Stizus bvevipennis 

 Walsh 1869 = Brendeli Taschb . 1875 und texanus Cress. 1872; [Sphecienus' 1 } 

 n. g. und Bembecinus Costa feklen in America] ; Stilus Latr. mit 7 spec. 

 Beijerinck , M. W. , Biorhita aptera Fabr. , ist heterogon mit Andricus lerminalis, in : 

 Katter's Entom. Nachr. 6. Jahrg. 1880. Nr. 5. p. 4546. Notiz von M'Lachlan. 

 ebenda. Nr. 7. p. 71. 



Biorhiza aptera Fabr. legt Ende Januar an den Seitenknospen der Stieleiche 

 mit der Legerohre durcli viele Knospenschuppen bohrend, die Eier. Die Knos- 

 penaxe wircl quer durcksagt und in die dadurch gebildeten Kammern werden eiue 

 groCe Zahl der langgestielten Eier abgelegt, wodurch die spongiose Apfelgalle der 

 Eiclie entsteht, aus der Anfang Juni Andricus terminate Fabr. ausfliegt, 

 v. Dalla Torre, K. W., Unsere Hummel- (Bombus-} Arten. in: Knauer, d. Naturhisto- 

 riker. 2. Bd. 1880. p. 30 und 4041. 



Eine Bestimmungstabelle und Aufzahlung der in Osterreich-Ungarn bisher be- 

 obachteten 27 Arten; die Gattung wird nach der Fai bung in die Gruppen Leuco- 



1 ) Megastizus n. gen. (p. 344): "Eighth ventral segment of the male forming a broad, 

 tridentate spine. Basal joint of intermediate tarsi not dilated and not excavated. Labruni 

 with its length not half as great, as its breadth. Submedial cell of the posterior wings 

 narrow, extending not more than its own breadth beyond the origin of the transverse 

 medial nervure. Head well rounded out behind the eyes ; axes of the eyes parallel, 

 the inner margin very slightly excavated above. Face broader than in Specius; clypeus 

 transverse, hexagonal, the upper side straight, the lower side excavated. The piece be- 

 ween the clypeus and the antennae longer than in Specius, but not keeled as in Stizus. 

 Mandibles short and stout, very unequally bidentate. Antennae slender, thickest at the 

 ninth joint, which is shorter than any other excepting the second ; third joint arcuated, 

 as long, as the fourth and fifth taken together. The antennae of the male unarmed, the 

 apical joint slender like the preceding joints, much excavated beneath, the apex sub- 

 truncate; the antennae not grooved and not pitted beneath; longer than in the female. 

 Body robust , abdomen of the male elongate and surpassing the wings. Thorax short, 

 metathorax vertically truncate; the base of the abdomen subtruncate and sessile. Legs 

 stout, the pulvillus large. Anterior tarsi short, joints two to four transverse; anterior 

 tarsi of the female slightly dilated exteriorly, but the joints not produced at the tip, 

 fringed externally with spines equalling the fifth joint in length. Intermediate tarsi 

 simple in both sexes, strongly spinose in the female. Spurs of the posterior tibiae not 

 half as long as the first tarsal joint. Sixth dorsal segment of the female suddenly narro- 

 wed just before the tip , the disk of this narrowed portion bounded laterally and po- 

 steriorly by a raised line, otherwise there is no dorsal area. Seventh ventral segment of 

 the male triangular ; the dorsal segment large and arched , its border rounded and very 

 slightly sinuate, the pleural pieces beneath large, subtriangular. The eighth dorsal seg- 

 ment of the male large and well formed, but concealed ; the eighth ventral represented 

 in the type by a large and flat tridentate spine. The claspers very large and complex. 

 Species: Stizus brevipennis Walsh und texanus Cress. 



2 ) Sphecienus n. gen. (Sphecius -- evoc). "Eighth ventral segment of the male armed 

 with one stout spine. Terminal joint of the male antennae elongate arcuate. Basal joint 

 of the intermediate tarsi of the male excavated beneath and dilated. Labrum semicircu- 

 lar. Submedial cell of posterior wings broad". Species: Stizus niyricornis Duf. (Sphe- 

 cius Costa nee Dahlb. ). 



