298 HYMEN OPTEEA. 



Second 2 to Mutilla proper. Further, notwithstanding that its basal abdominal seg- 

 ment, as shown by his figure, is distinctly petiolated and not widened towards the apex, 

 nor confluent with the second, he places it in our first section. Under these circum- 

 stances it may be as well to give a detailed description of the Guerrero specimen. 



The head transverse in front and behind, largely developed behind the eyes and not 

 narrowed there ; covered all over with a dense pale golden pubescence and long pale 

 golden hair, which hides the sculpture ; the apex of the clypeus deeply and roundly 

 incised, the angles almost tooth-like ; the mandibles ferruginous, the apex broadly 

 black. The antennae ferruginous, the apical joints fuscous and covered with a dense 

 pale microscopic pile ; the scape punctured, sparsely haired ; the third and fourth 

 joints subequal. The thorax much narrower than the head, elongate, narrowed behind, 

 dull ferruginous, the sides of the median segment blackish, the pronotum infuscated 

 laterally ; punctured, but not very strongly ; above covered with long black hairs ; in 

 front of the tooth on the mesonotum is a patch of golden pubescence ; the pleurae 

 covered with silvery pubescence, especially thick at the base and apex ; the tooth pale 

 yellow, flattened laterally, and with the apex rounded ; the median segment elongate, 

 and with a gradually rounded slope to the apex. Abdomen dull ferruginous ; the 

 first segment not dilated towards the apex, broader than long, the base depressed, the 

 apex broadly covered with silvery pubescence ; the second segment coarsely alutaceous 

 above, the sides with large punctures ; the base of the third segment has large, widely 

 separated punctures, this being the case also with the fourth and fifth segments, but 

 the punctured belt is narrower. On the base of the second segment are two somewhat 

 oval golden maculae ; there is a similarly coloured band along the sides and apex of 

 the same segment, but not extending all the way across ; there are golden spots on the 

 sides of the third and fourth segments, those on the latter uniting obliquely at the 

 apex ; the fifth segment has the golden marks united at the top and bottom in the 

 middle, but with a small glabrous mark in the centre. The pygidium is punctured, 

 and covered with golden pubescence in the centre ; the sides bear long black hair. 

 The basal ventral segment has a somewhat oval keel at the base ; the second segment 

 is strongly punctured and has a band of silvery hair at the apex ; the third segment is 

 pilose at the base, the middle finely transversely striated, the apex with a punctured 

 belt, narrowed in the middle. The legs reddish, covered with white hair ; the hind 

 tarsi with the pubescence fulvous, that on the basal joint being very dense ; the calcaria 

 white, about one third of the length of the metatarsus. 



44. Mutilla sinaloa. 



Mutilla cinaloa, Blake, Trans. Am. Ent. Soc. iii. p. 203 *, and xiii. p. 231 2 . 

 Hah. Mexico (Sumichrast 1 2 ). 



This species is doubtless a close ally of the preceding ; but it differs in the thorax 



