# A review of Gorytini in the Neotropical Region (Hymenoptera: by R. M Bohart

By R. M Bohart

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C). In this apparatus the difmeasures p l p = %p

Re- P and by the sections d^ and da2 p 2 and let the normal at Q make an angle with PQ. The volume Q, denned , be P! and FIG 1-3 (6) , of fluid within the cylinder is I dai , F be the component in the direction of PQ of the external force per unit mass of fluid, and let / be the acceleration of the cylinder in the direction PQ. Then if p is the density, the second law of where I is infinitesimal. Let motion gives p l da^ p 2 dcr2 cos Now, dcr 2 we let If cos 6 Q da lt Q will I Q is by dal , tend to zero and therefore coincides with the normal to the section at at F pi da^ = f pi do-v Therefore dividing approach P, Thus when zero.

Let is then have x= 2>(b A c) + #(C A Form the scalar product with a which is a) + r(a A b). perpendicular to (c A a) and (a A b). Then which determines p. D. THE INDEFINITE OR DYADIC PRODUCT 2*16] 33 Given two vectors a, b, 2*16. The indefinite or dyadic product. addition to the scalar and vector products, we introduce the indefinite in or dyadic product. a;b. This product, which we call a dyad, has no geometrical interpretation. an operator of great use in transforming vector expressions. g. (a;b) + (c;d)+(e;f) is The brackets may be omitted.