MYZINE. 249 



four anterior femora black, the hinder coxae marked with yellow ; the femora yellow, 

 suffused with rufous ; the tibiae and tarsi rufous. The hair on the legs long and 

 white ; the calcaria white ; the hind femora shining and impunctate. The abdomen 

 above shining, the black with bluish reflections ; there is on the basal segment a broad 

 yellow band ; on the second segment are two large yellow marks, and on the third and 

 fourth a broad yellow band incised in the middle at the apex ; the fifth segment has an 

 unbroken yellow band ; the pygidium is yellow, rufous at the apex, and strongly 

 longitudinally striated ; on the ventral surface there are two yellow marks on the first, 

 second, and third segments, the marks becoming successively smaller ; the segments 

 above and beneath are punctured, but not strongly ; the apical ventral segment is 

 smooth, impunctate, except at the apex, which bears some large punctures ; the ventral 

 surface and the sides are sparsely covered with long white hair. Wings yellowish- 

 hyaline, a broad fuscous band along the apex ; the costa and stigma ferruginous, the 

 nervures pale testaceous.- 



A variety from Guatemala has the black marks on the head prolonged — at first 

 narrowly, then expanding behind, this part being united to the eyes by a short black 

 line, which is widest at the eyes ; the yellow part of the pronotum with a small black 

 mark in the centre ; the mesopleurae with two yellow marks ; the median segment with 

 a four-angled mark at the base, a smaller elongated line at the apex, and the sides 

 broadly, yellow, this yellow being continued at the apex to the metapleurae ; the hind 

 femora broadly black at the base ; the pygidium yellow, except at the apex, which is 

 ferruginous ; and the wings darker coloured. 



A specimen from Chilpancingo, Mexico, is much darker coloured : the black on the 

 vertex extends to the antennal plates ; the vertex is ferruginous (but this may be caused 

 by discoloration) ; the pleurae have only a small mark below the tegulae ; the apical 

 part of the pronotum is only yellow at the sides and at the apex ; the yellow marks on 

 the mesonotum are smaller ; the scutellum is entirely black, except a small yellow 

 mark ; on the median segment there are only two short lines at the sides ; the femora 

 are black, being only yellowish at the apex ; and the hypopygium is black, rufous round 

 the apex. In this variety the punctuation is much stronger ; the wings are as in the 

 type. 



These three forms are tolerably constant in coloration, although each shows some 

 variation ; but as I can find no structural differences between them, I prefer to treat 

 all three as forms of one species. The coloration of the abdomen is constant in each. 



3. Myzine pulchriceps. (Tab. XII. figg. 21, s; 22, $ .) 



Nigra, lsete flavo-maculata, femoribus flavis, tibiis tarsisque ferrugineis ; alis fulvo-hyalinis. 

 Long. 11 millim. 



Hdb. Mexico, Tierra Colorada, Rio Papagaio, and Venta de Zopilote, all in Guerrero 

 (H. H. Smith), San Bias in Jalisco (Schumann). 



biol. cente.-amee., Hymenopt., Vol. II., October 1893. 2kk 



