Synonymy.—Evania minuta Olivier [Kieffer, 1920].
Natural hosts.—Blattella germanica, Europe? (Schletterer, 1889; Kiefer, 1912; Crosskey, 1951).
Ectobius lapponicus, Europe? (Schletterer, 1889; Kieffer, 1912; Crosskey, 1951).
Ectobius panzeri var. nigripes? Great Britain (Blair, 1952): This is a presumptive record. The wasp was collected at Niton and Headon Hill, Isle of Wight, an area in which this variety of E. panzeri was the only species of cockroach known to occur.
Ectobius sp., England (Cameron, 1955, 1957): Natural History Museum records.
Adult wasps have been collected on Asparagus officinalis Linnaeus (Schmiedeknecht in Schletterer, 1889; Crosskey, 1951). Thompson's (1951) citation of records of B. minutus and Evania appendigaster from Blatta orientalis and Blattella germanica, and Cameron's (1957) citation of these records and one from Ectobius lapponicus, all attributed to Kadocsa (1921), are almost certainly in error. Kadocsa (1921, p. [33]) listed these wasps as egg parasites of cockroaches but not necessarily in Hungary and did not name specific cockroach hosts.
The present writers have found no information, other than host reports, on the biology of Brachygaster minutus. The records of this wasp parasitizing B. germanica may trace back to Schletterer, but his listing may not have been an original observation. Since the female of B. germanica carries its oötheca attached to the abdomen until or just before the eggs hatch, it would seem that the female of B. minutus (if the host records are valid) must oviposit into the oötheca of this species while it is still being carried by the female; this would not necessarily be true for the other hosts which drop the egg case long before the eggs hatch.
Distribution.—Europe: Sweden, Russia, England, France, Germany, Austria, Hungary, Switzerland, Italy (Kieffer, 1920).
Evania appendigaster (Linnaeus)
Synonymy.—Evania desjardinsii Bordage, Evania laevigata Latreille [Dalla Torre, 1901-1902].