Millipede assassin bugs are a diverse group of specialized millipede predators. However, the feeding behavior of Ectrichodiinae remains poorly known, especially how the mouthpart structures relate to various functions in feeding. In this study, fine morphology of the mouthparts and feeding performance of Haematoloecha nigrorufa (Stål, 1867) was observed and described in detail for the first time. The triangular labrum is divided by a conspicuous transverse membrane into a strongly sclerotized basilabrum and a less sclerotized distilabrum. Fifteen types of sensilla are distributed on the mouthparts. Each mandibular stylet has an expanded spatulate apex and about 150 approximately transverse ridges on the external middle side; these help in penetrating the ventral trunk area and the intersegmental membranes of millipede prey. The right maxilla is tapered. On the internal surface are a row dorsal short bristles near the apex and a row of ventral bristles preapically. A longitudinal row of long lamellate structures extend proximate for a considerable distance, lie entirely within the food canal, and bear several short spines and short bristles. There is no obvious difference between males and females in the distribution, number, and types of sensilla on mouthparts. The adult feeding process involves several steps, including searching and capturing prey, paralyzing prey, a resting phase, and a feeding phase. The evolution of the mouthpart morphology and the putative functional significance of their sensilla are discussed, providing insight into the structure and function of the mouthparts adapted for millipede feeding.

中文翻译：

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Haematoloecha nigrorufa（Stål）（半翅目：Reduviidae）口部的独特精细形态适合千足虫饲养。

千足虫刺客臭虫是由千足虫专门组成的各种天敌。然而，外生双歧杆菌的进食行为仍然知之甚少，尤其是口器结构如何与进食中的各种功能相关。在这项研究中，Haematoloecha nigrorufa的口部形态和进食性能良好（Stål，1867）首次得到观察和详细描述。三角形唇由明显的横向膜分为坚硬的盘状基底和不坚硬的双侧膜。十五种类型的感官分布在口器上。每个下颌管心针有一个扩张的粉刺状的先端，在中间外侧有大约150个横向脊。这些有助于穿透腹足区域和千足类猎物的节间膜。右上颌是锥形的。在内表面上，在顶点附近有一排背短硬毛和一排腹部刚毛。一排长条状的薄片状结构的纵向行靠近一段相当长的距离延伸，完全位于食道内，并带有几根短刺和短硬毛。男性和女性在口器上的感官分布，数量和类型没有明显差异。成年饲养过程涉及几个步骤，包括搜索和捕获猎物，使猎物瘫痪，静止期和喂养期。讨论了口器形态的演变及其感觉器的假定功能意义，从而为适合千足虫喂养的口器的结构和功能提供了见识。