958 THE ENTOMOLOGIST. 
to Mr. R. South for confirming the names of hosts, and to Mr. 
B. S. Harwood, of Colchester, who has sent me for examination 
a considerable number of specimens, most of which have come 
to him from the collection of the late E. A. Fitch. Although 
the main part of the Fitch collection is now in the Essex 
Museum at Stratford, it would seem that the insects which are 
at present in the possession of Mr. Harwood were put on one 
side in store-boxes, some as duplicates and others as being un- 
named, or to await naming, and have so remained for the past 
twenty years or more. 
In the following notes, unless otherwise stated, the records 
are my own, and the insects mentioned have been captured or 
bred in the New Forest. 
Macrocentrus, Curtis.* 
Gregarious or solitary parasites of larve of Lepidoptera. 
Ratzeburg records one species as having been bred from the 
coleopteron Anobium pertinax, but this has never been confirmed. 
The general colour of these insects is black with rufous or 
testaceous markings. In the few cases where I have noticed the 
larve, they have been elongate and whitish without any very 
noticeable markings. It is possible that in all the species the 
larve may be partially external parasites, for with M. abdomi- 
nalis and M. equalis I have found that, although internal feeders 
when small, the larve feed for three or four days as external 
parasites after emerging from their host, during which time 
they rapidly increase in size. 
(8) 1. Antenne with forty-five or more joints. 
(3) 2. Third abdominal segment (like the two pre- 
ceding) entirely striolate t 1. abdonunalis (Fab.). 
(2) 3. Third abdominal segment smooth, or strio- 
late at base only. 
(7) 4. Body entirely black. 
(6) 5. Stout species, wings clouded . 2. marginator (Nees). 
(5) 6. Slender species, wings hyaline . 3. nitidus (Wesm.). 
(4), i-) Thorax zutous \s : 3 é 4. thoracicus (Nees). 
(1) 8. Antenne with forty or less joints. 
(12) 9. Second abscissa of radius as long as the first 
intercubital nervure. 
(11) 10. Body entirely black, terebra longer than 
body ; , ; : 5. infirmus (Nees). 
(10) 11. Thorax partly rufo-testaceous, terebra not 
longer than the abdomen : 6. equalis (sp. nov.). 
(9) 12. Second abscissa of radius much shorter than 
first intercubital nervure : 7. collaris (Spin.). 
M. abdominalis, Fab.t— Without doubt the commonest species 
in the genus, having now been recorded as bred from nearly 
* Ent. Mag., vol. i., p. 187. | Ent. Systematica, 2, 185. 
